初中英语分类练习
——连词部分
I. 填入适当的连词。
1. My brother is ill, ________ I have to stay at home.
2. The film must be very interesting, ________ many people are buying tickets in line.
3. My computer is new, ________ it is too expensive.
4. She felt hungry, ________ she didn’t have breakfast.
5. A customer came in, ________ I stopped my work.
6. He has a lot of money, ________ he spends little.
7. Come here early, ________ you can’t see him.
8. Take some medicine, ________ you will feel better.
9. There are a lot of stories about the UFOs, _______ no one knows whether they are true or not.
10. Put on your coat, ________ you will catch cold.
11. She got a ―C‖ in English test, ________ she had tried his best.
12. My little cousin can _________ read ________ write.
13. Please call me _______ you need my help.
14. _____you have a few more days’ rest, you’ll feel better.
15. _____ my father ______ my mother is a doctor. They are teachers.
16.
17.
18.
19. I really don’t know ______ it is going to rain or not this afternoon. You may ______do it yourself ________ leave it to me. Hurry up, ______ you’ll miss the next bus. Li Ming was a brave boy, ______ he had one shortcoming.
20. It’s a fine day, ____ we have a wonderful time.
21. I don’t know _______ she can speak Russian or not.
22. We haven’t decided _____ and ______ we shall meet next time.
23. That’s ______ they didn’t pass the exam.
24. _______ you are right, _____ he is.
25. He ______ _____ read the book ______ _______ remembered what he read. II.选择填空：
1. They are all new, ________ I’m not.
A. and B. but C . so D . or
2. Is there a letter ______ a postcard ? There’s a letter.
A . and B . or C . not D. but
3.The old woman can’t read ______ write.
A . and B . or C . but D . and can
4. ___ my classmates ____ our class teacher was there then.
A . not only…but also… B . both… and…C . Neither… or… D . Either…nor…
5. Have one more try, ______ you will not succeed.
A . and B . or C. then D . but
6. ____ you are ill, you should go to the clinic right now.
A . For B. Though C. Until D. Since
7. ______ the midnight he waited for his mother.
A. Till B. Since C. Until D. At
8._____the men drivers ______ the woman driver have been to the village.
A. Neither…nor… B. Both of…and C. Either…or… D. None of…and…
9.She is the lady _______ helped the old woman yesterday.
A. whom B. which C. what D. who
10. –Are your father and mother retired? -Well, _____ of them is. ______ of them are at work.
A. both, Neither B. none, All C. neither, Both D. all, None
11. _____he felt tired, ____ he still went on working.
A. Because, so B. Although, but C. / , so D. Though, /
12. I’ll offer some bread to Li Ming. Li Ming,_______, may not want it.
A . but B . however C . yet D. still
13. ___ I looked for my toy, I could not find it.
A. But B. Yet C. Because D. However
14. I don’t know _______ this evening.
A. if he will be free B. whether he is free C . when he is free D. when is he free
15. There’s ______ on the moon.
A . no air but water B. not any air or water C . not any air and water D. no air or no water
16. Lucy has seen the film , _______ Lily hasn’t .
A. and B. or C. but D. so
17. Hurry up , _______ we will miss the trian .
A. but B. and C. or D. so
18. — I’m going to Hangzhou for a holiday this weekend .
— _______ you are there , can you buy me some green tea ?
A. Because B. While C. If D. Though
19. _______ he was out of the room , he turned back and knocked at the teacher’s door again .
A. Before B. Since C. As soon as D. Until
20. Study hard , _______ you’re sure to have a good result in the exam !
A. but B. and C. for D. or
21. I’m looking for a babysitter （保姆） . She must be _______ too old _______ too young .
A. neither ; nor B. both ; and C. either ; or D. not only ; but also
22. Which is bigger , the sun _______ the moon ?
A. or B. and C. but D. so
23. Why not look up the new word in a dictionary _______ you don’t know it ?
A. if B. that C. though D. whether
24. _______ all the passengers are here , why don’t we start at once ?
A. As soon as B. After C. Now that D. When
25. He hurt her _______ badly _______ she had to see a doctor .
A. too ; that B. so ; that C. either ; or D. too ; to
26. I can’t understand this passage _______ there are no new words in it .
A. if B. because C. though D. and
III.把下列句子译成英语：（用括号内连词）
1． 虽然天已很晚了，但他仍在写作。
2． 人类没有水和空气就不能活。
3． 他把这件事告诉我前，没有人知道这件事。
4． 如你不赶紧，你就要开会迟到。
5． 他写字不如她仔细。
6． 我们不仅去了北京，也去了哈尔滨。
7． 他准是开玩笑，要不他是疯了。
8． 等他一到我们就去弄点咖啡。
9． 众所周知，金钱不会从树上长出来的。
10. 他什么时候到的，我们大家都不知道。
IV.改错：
( )1. Not only May but also her sisters was asked to sing some songs.
A B C D
( )2. Bread and butter in the shop are sold out.
A B C D
( )3. What I miss most badly are the pleasant hours we spent together.
A B C D
( )4. Please let me know if he will comes back tomorrow.
A B C D
V.句子转换：
1. The boy is too young to go to school.
The boy is ________ young _______ he can’t go to school.
2. I wonder if I will visit her after school.
I wonder ________ to visit her after school.
3. Be brave, and you’ll succeed.
______you are brave, you will succeed.
4. Both Li Hun and his parents are going to visit the flower show.
______ ______ Li Hun ______ _______ his parents are going to visit the flower show.
5. The more you practise speaking, the better your spoken English will be. _________ you practise speaking more, your spoken English will be better.
6. This shirt is less beautiful than that one.
That shirt is ______ beautiful _______ this one.
7. You didn’t understand it before your father explained it to you.
________your father explained it to you, you didn’t understand it
8. Since you feel so tired, you’d better have a good rest.
________ ______ you feel so tired, you’d better have a good rest.
9. He has lost his bike, so had to buy another one bike.
________he has lost his bike, he had to buy another one.
10. If you don’t study harder, you will fail in the test.
Study, harder, ______ you will fail in the test.
附加练习
1. I’d like to go shopping with you, _____ I’m too busy today.
A. but B. and C. so D. or
2. I’m different from my twin sister. I love dancing, _____she is interested in reading.
A. so B. or C. but D. and
3. Hold on to your dreams, _____they will come true one day.
A. but B. and C. or D .so
4.-Somebody is waiting outside. He wants to see you. -_____no one knows I’m here.
A. For B. And C. But D. So
5. I don’t understand the text _____ there are few new words in it.
A. so B. because C. if D. though
6. We didn’t have enough chairs, _____some of the students had to sit on the floor.
A. but B. so C. or D. and
7. _____Mrs Wilson came into the classroom, all the children welcomed her
A. Whether B. As well as C. If D. As soon as
9. _____he isn’t rich enough, he often gives away money to some poor children.
A. Though B. When C. Because D. If
10. _____our football team failed in the match, we tried our best.
A.AS B. Though C. Because
11.-Would you like to play basketball with us?
-Yes, I’d love to. _____I’m afraid I have no time.
A. So B. But C. Or D. And
12.It was snowing hard _____ we had to stay at home and watch TV.
A. that B. so .C. but D. because
13.-It’s a long story, _____you can hardly find any new words in it.
-Good! _____it will be too hard for children.
A. so, Then B. and, Or C. but, Or D. though, And
14.Take more exercise, _____you’ll be healthier.
A. and B. or C. but D. then
15.-You saw the film Harry Potter last night,didn’t you?
-Yes, _____ I missed the beginning.
A. and B. so C. but D. then
16.-There are many pictures in the book.
-Great! _____ it will be hard for young children to read.
A. and B. So C. But
17. I had invited everybody , ______ only two people came to ma party.
A. or B. but C. and D. so
18. You’ll do much better ______ you’re more careful with your spelling.
A. if B. before C. although D. unless
20.This dress still looks pretty on you , ______ it is out of style.
A. though B. but C. since D. if
21. What should I do ______ I want to be thinner ?
A. though B. unless C. but D. if
22.-Would you please give this MP3 to Mary ?
-Sure. I’ll give it to her ______ she come back..
A. before B. as soon as C. till
23. The question is ______ he won’t listen to anyone.
A. that B. whether C. if D. when
24.-Your picture is wonderful!
-I worked for 8 hours ______ I finished it.
A. when B. before C. while D. after
25. Maths is not easy to learn, ______ we must work herder.
A. but B. or C. so C. and
26. Ted tried his best, ______ he caught up with the others at last.
A. but B. or C. and D. because
27. He can’t decide which to choose ______ there is no difference between them.
A. but B. so C. because
28. Mr Huang decided to buy that CD player ______ it was expensive.
A. even though B. so that C. because D. as if
30. A good friend always gives you a helping hand ______ you’re in trouble.
A. when B. before C. until D. though
31. He didn’t know the news _______ his parents told him about it.
A. when B. after C. as soon as D. until
32. ______ he said he wasn’t hungry at all, he ate a big breakfast.
A. Unless B. Because C. If D. Though
33. –You watched the fashion show last week, didn’t you?
- Yes, ______ I missed the beginning.
A. or B. so C. and D. but
34.I will wait ______ he come back, because I have something to tell him.
A. until B. before C. when
35. Take more exercise, _______ you’ll be healthier.
A. and B. or C. but
36. Woke hard, _______ you will fall behind.
A. or B. and C. so D. so but
37. There was ______ smoke that they couldn’t see anything clearly.
A. too B. too many C. so much D. so many
38. The two friends were ______ pleased to see each other that forgot everything.
A. so B. too C. very D. much
39. He had ______ much work to do that he couldn’t go out.
A. so B. much C. as D. or
40. Tom has been in the factory ______ he left school.
A. when B. since C. as soon as D. whether
41. The nurse doesn’t feel well today, ______ she still works very hard.
A. but B. and C. or D. when
42. ______ my mother ______ my sister watches TV plays these days.
A. Either, not B. Both, and C. Neither, or D .Neither, nor
43. Lucy knew nothing about it ______ her sister told her.
A. because B. until C. if D. since
44. I left my umbrella in my room. Could you wait ______ I go back to get it?
A. when B. if C. while D. before
45. Study hard, ______ you will fall behind the other.
A. and B. but C. or D. though
参考答案
I、1.so 2.for 3.besides 4.as 5.so 6.but 7.or 8.and 9.but 10.or
11.though 12.neither, nor 13.if/when 14.if 15.neither, nor 16.whether
17.either, or 18.or 19.though 20. 21.whether 22. 23.why
24.Either,or 25.not only, but also
II、
1.B 2.B 3.B 4.A 5.B 6.D 7.C 8. B 9.D 10.C
11.D 12.B 13.D 14.A 15.B 16. C 17. C 18. B 19. C 20. B
21. A 22. A 23. A 24. C 25. B 26. C
III、
1. Though it was very late, he was still writing. / It was very late, but he was still
Working.
2. Men can’t live without air or water.
3. None knew it until he told me.
4. Unless you hurry, you’ll be late for the meeting.
5. He doesn’t write as careful as her.
6. We went to Beijing and as well as to Haerbin.
7. He must be making a joke or else he must be mad.
8. Well get some coffee as soon as he arrives.
9. Everybody knows that money doesn’t grow on trees.
10. None knows when he arrived.
IV、
1. C was改成 were 2. C are改成 is 3. B are改成 is 4. D comes 改成 come
V、
1. so, that 2. whether 3. If 4. Not only …..but also…are
5. If 6. more …than 7. Until 8. Now… that 9. Because 10. or
附加练习
1---5 ACBCD 6---10 BD AB
11---25 BBCAC 16---20 BBA A
21---25 CBABC 26---30 CCA A
31---35 DDDAA 36---40 ACAAB
41---45 ADBCC
复合句专项练习
---宾语从句
一、合并宾语从句
(1)These flowers are from Guangdong. He said.
He said _______ these flowers _______ from Guangdong.
(2)Light travels faster than sound. My teacher told me.
My teacher told me _____ light _______ faster than sound.
(3)There will be a meeting in five days. Jack didn’t know.
Jack didn’t know ______ there ______ ____ a meeting in five days.
(4)Can they speak French? I want to know.
I want to know ______ _______ _______ _______ French..
(5)Are the children playing games? Tell me.
Tell me ______ the children ______ ______ games.
(6)Have you finished your homework yet? Mr. Zhao asked Ma Chao
Mr. Zhao asked Ma Chao _______ _______ ______ _____ _____ homework yet.
(7)How many people can you see in the picture? Who knows?
Who knows _____ _____ ____ ____ _____ ______ in the picture?
(8)Where did she park her car? Do you know?
Do you know _____ _____ ____ her car?
(9)What does he often talk about? The girl wondered.
The girl wondered _____ _____ often ________ about.
(10)Who knocked at the door so loudly? I don’t know.
I don’ t know ____ _______ at the door so loudly.
二、选择填空。
( )(1)What did Mike say? He said ____________________.
A. if you were free the next week B. what colour was it
C. the weather is fine D. summer comes after spring
( )(2)Tom asked my friend ________________.
A. where was he from B. that the earth is bigger than the moon
C. when did he come back D. not to be so angry
( )(3)Let me tell you __________________.
A. how much is the car B. how much does the car cost
C. how much did I pay for the car D. how much I spent on the car
( )(4)Peter knew _______________.
A. whether he has finished reading the book B. why the boy had so many questions
C. there were 12 months in a year D. when they will leave for Paris 参考答案:1.(1)that, were (2)that, travels (3)if, would be (4)if , they can speak (5)if, are playing (6)if, she had finished her (7)how many people you can see (8)where she parked
(9)what he, talked (10)who knocked
2.(1)D (2)D (3)D (4)B
---状语从句专项练习
选择合适的连接词，完成下列句子。
1.Jim spends a lot of money on books______he is not rich.
2.Kate fell into sleep ______she was listening to the music.
3.----Is David at school today?
----No. He is at home ______he has a bad cold.
4.We won't have supper ______my mother comes back.
5.Speak to him slowly ______he may understand you better.
6. ______ she doesn't come on Sunday, I'll go fishing by myself.
7.It is four years ______I had left that small village.
8. ______the air moves, it is called wind.
9.We will go to the park ______it doesn't rain tomorrow.
10.______little boys did ______much work.
11.There are few new words in the passage ______we can't understand it.
12.Go back ______you come from.
13.He reached the station ______the train had left.
14.----Do you have a swimming pool?
----No, we don't. At least, not ______big ______yours.
15.Give me your paper ______you have finished it.
16.It is raining hard, ______we have to stay at home.
17. ______you work harder, you'll never pass the final exam.
18.Look after te children ______I am out.
19.The village is ______far away ______I can't get there on foot.
20.That is ______an interesting book ______I can't stop reading it.
Keys: 1.though 2.while 3.because 4.until 5. so that
6.Even if 7.since 8.when 9.if 10.Such, do
11.but 12.where 13.before 14.as(so), as 15.after
16.so 17.unless 18.while 19.so, that 20.such, that
---定语从句专项练习 1.The place _______interested me most was the Children's Palace.
A. Which B. where C. what D. in which
2.Do you know the man _______?
A. whom I spoke B. to who spoke C. I spoke to D. that I spoke
3.This is the hotel _______last month.
A. which they stayed B. at that they stayed
C. where they stayed at D. where they stayed
4.Do you know the year ______the Chinese Communist Party was founded?
A. which B. that C. when D. on which
5.That is the day ______I'll never forget.
A. which B. on which C. in which D. when
6.The factory ______we'll visit next week is not far from here.
A. where B. to which C. which D. in which
7.Great changes have taken place since then in the factory _______we are working.
A. where B. that C. which D. there
8.This is one of the best films _______.
A. that have been shown this year B. that have shown
C. that has been shown this year D. that you talked
9.Can you lend me the book ______the other day?
A. about which you talked B. which you talked
C. about that you talked D. that you talked
10.The pen ______he is writing is mine.
A. with which B. in which C. on which D. by which
11.They arrived at a farmhouse, in front of ______sat a small boy.
A. whom B. who C. which D. that
12.The engineer ______my father works is about 50 years old.
A. to whom B. on whom C. with which D. with whom
13.It there anyone in your class ______family is in the country?
A. who B. who's C. which D. whose
14.I'm interested in ______you have said.
A. all that B. all what C. that D. which
15.I want to use the same dictionary ______was used yesterday.
A. which B. who C. what D. as
16.He isn't such a man ______he used to be.
A. who B. whom C. that D. as
17.He is good at English, ______we all know.
A. that B. as C. whom D. what
18.Li Ming, ______to the concert enjoyed it very much.
A. I went with B. with whom I went C. with who I went D.I went with him
19.I don't like ______ as you read.
A. the novels B. the such novels C. such novels D. same novels
20.He talked a lot about things and persons ________they remembered in the school.
A. which B. that C. whom D. what
21.The letter is from my sister, ______is working in Beijing.
A. which B. that C. whom D. who
22.In our factory there are 2,000 workers, two thirds of ____are women.
A. them B. which C. whom D. who
23.You're the only person ______I've ever met ______could do it.
A. who;/ B./; whom C. whom;/ D./; who
24.I lost a book, ______I can't remember now.
A. whose title B. its title C. the title of it D. the title of that
25.Last summer we visited the West Lake, ______Hangzhou is famous in the world.
A. for which B. for that C. in which D. what
26.I have bought such a watch _______ was advertised on TV.
A. that B. which C. as D. it
27.I can never forget the day ____ we worked together and the day ___ we spent together.
A. when; which B. which; when C. what; that D. on which; when
28.The way ______he looks at problems is wrong.
A. which B. whose C. what D./
29.This is the reason ______he didn't come to the meeting.
A. in which B. with which C. that D. for which
30.This machine, ______for many years, is still working perfectly.
A. after which I have looked B. which I have looked after
C. that I have looked after D. I have looked after
31.The reason ______he didn't come was ______he was ill.
A. why; that B.that;why C. for that;that D.for which;what
32.He is working hard, ______will make him pass the final exam.
A.that B.which C.for which D.who
33.That is not the way ______I do it.
A./ B.which C.for which D.with which
34.I have two grammars, ______are of great use.
A. all of which B. either of which C. both of that D. both of which
35.I want to use the same tools _______used in your factory a few days ago.
A. as was B. which was C. as were D. which
36.My neigh bours used to give me a hand in time of trouble, ____ was very kind of them.
A. who B. which C. that D. it
37.This is the magazine _______ I copied the paragraph.
A. that B. which C. from that D. from which
38.He is not such a man _______ would leave his work half done.
A. that B. which C. who D. as
39. You can depend on whatever promise _______ he makes.
A. / B. why C. when D. whose
40. Smoking, _______ is a bad habit, is, however, popular.
A. that B. which C. it D. though
41. --- Did you ask the guard _______ happened?
--- Yes, he told me all _______ he knew.
A. what; that B. what; what C. which; which D. that; that
42. I shall never forget those years _______ I lived on the farm with
the farmers, _______ has a great effect on my life.
A. when; who B. that; which C. which; that D. when; which
43. The number of the people who _______ cars _______ increasing.
A. owns; are B. owns; is C. own; is D. own; are
44. During the days ________, he worked as a servant at the Browns.
A. followed B. following C. to follow D. that followed
45. Is oxygen the only gas _______ helps fire burn?
A. that B. / C. which D. it
46. The clever boy made a hole in the wall, ____ he could see ____ was going on inside house.
A. which; what B. through which; what C. through that; what D. what; that
47. Is _______ some German friends visited last week?
A. this school B. this the school C. this school one D. this school where
48. John got beaten in the game, _______ had been expected.
A. as B. that C. what D. who
49. I have bought two ballpens, _______ writes well.
A. none of them B. neither of them C. neither of which D. none of which
50. All that can be eaten _______ eaten up.
A. are being B. has been C. had been D. have been
参考答案及解析
1. A. which用作关系代词，在定语从句中作主语。
2．C. "和谁讲话”要说speak to sb. 本题全句应为Do you know the man whom I spoke to.。whom是关系代词，作介词to的宾语，可以省略。
3. D. where是关系副词，表示地点，在定语从句中作地点状语。
4. C. when是关系副词，表示时间，在定语从句中作时间状语。
5．A. which是关系代词，在从句中作forget的宾语。其他几个答案都不能作宾语。
6．C. 解析同第5题。
7. A. 解析见第3题。
8. A. 本句话的先行词应该是films,因此，关系代词that是负数概念，其谓语动词应用复述的被动语态have been shown。如果句中的one前面使用了定冠词the，则the one应该视为先行词。
9. A. “谈到某事物”应说talk about sth.。about是介词，其后要用which作宾语，不能用that。
10. A. with which是"介词+关系代词"结构,常用来引导定语从句.with有"用"的意思,介词之后只能用which,不能用that. with which在定语从句中作状语,即he is writing with a pen.
11. C. in front of which 即in front of a farmhouse. In front of which在从句中作状语.
12. D. with whom引导定语从句.with whom放在从句中即为:my father works with the engineer.
13. D. whose引导定语从句,在从句中作主语family的定语.
14. A. that引导定语从句,因为先行词是all,所以只能选用that引导.
15. D. the same……..as是固定用法, as引导定语从句时,可以作主语,宾语或表语.在本句话中,as作从句的主语.
16. D. such……… as是固定用法,as引导定语从句时,可以作主语,宾语或表语.在本题中,as作表语.
17. B. as作关系代词可以单独用来引导非限制性定语从句。这时as所指代的不是主句中某个名词，而往往指代整个主句的含义。as在从句中可以作主语、宾语。从句可放在主句后，也可置于主句前。在本句中,as作宾语.
18. B. Li Ming enjoyed it very much是主句,with whom I went to the concert是定语从句.with whom放在从句中为:I went to the concert with Li Ming.
19. C. as引导定语从句时通常构成such…as或the same…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。 as在从句中可以作主语、表语或宾语。Such修饰单数名词时,要用such a……..,本题中such books, such直接修饰复数名词.
20. B. things和persons是先行词.当定语从句要修饰的先行词是既表示人,又表示物的名词时,其关系代词要用that.
21. D. who引导非限制性定语从句,who作从句的主语.
22. C. two thirds of whom 即:two thirds of the 2,000 workers.
23. D. 先行词person后有两个定语从句,第一个从句省略了关系代词whom.因为, whom作从句中met的宾语,可以省略.第二个从句who could do it.who在从句中作主语,不可省略.
24. A. whose title引导非限制性定语从句,whose title也可以说成the title of which
25. A. for which 引导定语从句,使用介词for,是来自于从句中的固定短语 be famous for "以……..而闻名".
26. C. 当先行词被such修饰时,引导定语从句的关系代词要用as. As在本从句中作主语.
27. A. 两个先行词the day都是表示时间的名词,但第一个空白处要填的关系词在从句中作状语,因此要用关系副词when. 第二个空白处要填的关系词在从句中作动词spent的宾语,因此要用关系代词which或that来引导定语从句.
28. D. 在way、distance、direction等词后的定语从句中，常用that来代替“in (或其他介词)+which”、when或where，而that常可省略。
29. D. for which在定语从句中作原因状语,可用why 来替代.
30. B. which I have looked after 构成一个非限制性定语从句.
31. A. The reason why… was that….已成为一种固定句型，这一句中的why和that不能随意换位，也不能将that改成because，尽管that这个词在译文中可能有 “因为”的含义。
32. B. 非限制性定语从句常用which引导,which表示前句话的整个含义.
33. A. 解释见28题.
34. D. 主句中的two表明不能选A.从句中的are表明不能选B. both of which用来引导非限制性定语从句.
35. C. as引导定语从句时通常构成such…as或the same…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。本题中as作从句的主语.
36. B. 非限制性定语从句常用which引导,which表示前句话的整个含义.
37. D.
38. D. 解析见35题.
39. A. he makes是定语从句, 从句前省略了关系代词that.
40. B. which is a bad habit 非限制性定语从句.
41. A. what happened是宾语从句. all 之后that he knew是定语从句.先行词是all,所以关系代词只能用that.
42. D. years是表示时间的名词,用when引导定语从句,是因为when在从句中作时间状语.第二个空选用which,引导一个非限制性定语从句.
43. C. 本句话的定语从句是who own cars. 其先行词是people,因此,定语从句的谓语动词要用复数的own。本句话主句的主语是The number of指“…..的数目”，是单数概念。因此，主句的谓语动词要用is。
44. D. that followed是定语从句，关系代词that在从句中作主语。
45. A. 先行词gas被only修饰，关系代词要用that，而不用which。
46. B. through which引导定语从句，through which即through the hole,在定语从句中作状语。What引导的是see的宾语从句，并作从句的主语。
47. B. 为便于理解，改写本句话：This is the school that some Germanfriends visited last week. 不难看出，作表语的the school是先行词。that引导了定语从句，因为that同时又作visited的宾语，所以被省略了。其它选项结构不对。
48. A. 解释见35题。
49. C. 因为是two ballpens, 并且定语从句的谓语writes是单数概念。因此，C是正确选项。
50. B. 本句话中，主句的主语是all,为抽象概念。因此，其谓语应用单数的has been。关系代词that引导定语从句，并在从句中作主语。