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
21.The letter is from my sister, ______is working in Beijing.
A. which
B. that
C. whom
D. who
非限定性定语从句，缺主语，用which可以吗？
正确答案D 定语从句先得看指代什么呢. 指代的是前面的人还是物? 前面有两个名词letter和sister，看后面的句子就看得出来 work(工作)，当然只有人能工作，信是不能工作的.所以需要一个代词指代前面的人并且做非限制性定语从句的逻辑主语呢
22.In our factory there are 2,000 workers, two thirds of ____are women.
A. them
B. which
C. whom
D. who
错题：非限定性定语从句，为什么选whom？是因为指代人，做宾语？
正确答案B  三分之二的….都是女人. 当然缺的代词是指代前面worker 的代词,worker是人，所以要用whom
23.You're the only person ______I've ever met ______could do it.
A. who;/
B./; whom
C. whom;/
D./; who
1）连接词引导的宾语从句，与the only固定搭配，可以省略。2）关系代词引导的宾语从句，缺主语
正确答案: D 不是宾语从句宾语从句是跟在谓语动词或者介词后面的从句.这是定语从句. 前面有一个名词，后面有一个句子起修饰限制作用，定语从句要看指代和成分，先行词person是人，并且作定语从句
的逻辑宾语，本来可以用whom,C 但先行词作定语从句的逻辑宾语的话，关系代词可以省略. 所以C 和D 都可以考虑. 后面的定语从句缺主语不能省略要选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
正确答案是A 非限定性定语从句
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
错题：非限定性定语从句，缺状语？
正确答案: A  非限制性定语从句先删除两个答案 B 没有介词加that 的用法,D 定语从句里没有what
在A for which 和in which里面选答案  which应该是指代west lake
认真读懂句子:  去年夏天我们游览了西湖___杭州在世界上闻名.
成人英语三级把答案代入 A 译为: