1. There are two caps on the table, _______ belongs to Tom.
A. the smaller of which B. the small of which C. the smaller of them D. the small one
2. My brother had become a doctor, ______ was what he wanted to be.
A. who B. what C. that D. which
3. There is a mountain _______ the top is always covered with snow.
A. whose B. of which C. it's D. that
4. Is there a post office around ______ I can get some stamps?
A. which B. what C. where D. that
5. He talked happily about the man and books _______ interested him greatly in the school.
A. which B. that C. who D. when
6. There isn't a dictionary _______ you can find everything.
A. that B. which C. where D. in that
7. He wanted to know the time ________ he needed to know.
A. that B. when C. where D. what
8. Lucy's pet cat died, _______ made her very sad.
A. as B. which C. that D. whose
9. This is one of the best films ________ this year.
A. have been show B. that have shown
C. that have been shown D. which has been shown
10. Is _______ some foreigners visited last week?
A. this factory B. this the factory C. this factory one D. the factory where
11. I'll give you ______ he gave me last week.
A. all which B. all what C. that all D. all
12. I'll never forget the day ________ I joined the army.
A. where B. when C. why D. that
13. That is the reason ________ he didn't come to your birthday.
A. why B. that C. which D. when
14. The doctor ________ we met at the gate works in the nearby hospital.
A. / B. who C. which D. he
15. His book is not the only thing _______ has been stolen.
A. that B. / C. which D. who
1. A 这是一个非限制性定语从句，先行词是two caps, 关系代词which在定语从句中作主语。C，D不是定语从句，指两个中较小的那个，应用形容词的比较级。故选A。
2. D 这是一个非限制性定语从句，先行词是doctor, 在本句中指职业。关系代词在定语从句中作主语。Who引导的定语从句先行词指人，that不用于非限制定语从句。What 不用于引导定语从句。故选D。
3. B 先行词是mountain, of which等于where, 在定语从句中作地点状语。Whose, that在定语从句中不作状语，it's不引导定语从句。故选B。
4. C 先行词是post office, 关系副词where在定语从句中作地点状语。Which, that不能在定语从句中作地点状语，what不引导定语从句。故选C。
5. B 先行词是the man and books，既有人又有物。关系代词that在定语从句中作主语。当先行词既有人又有物时，只能用that引导定语从句。故选B。
6. C 先行词是a dictionary, 关系副词where在定语从句中作状语。That, which在定语从句中不作状语。That在定语从句中作介词宾语时，介词不可以放在它的前面。故选C。
7. A 先行词是the time, 关系代词that在定语从句中作know的宾语。When, where在定语从句中不作宾语，what不引导定语从句。故选A。
8. B 这是一个非限制性定语从句，关系代词which在定语从句中作主语，指代Lucy's pet cat died这一个句子。在引导非限制性定语从句时，which可代表前面的一句话，译成"这一点，这件事"。As引导定语从句时，不可指代一个句子，that不用于非限制性定语从句，this不引导这定语从句。故选B。
9. C 先行词是the best films，关系代词that在定语从句中作主语。当先行词是最高级或被最高级所修饰时，只能用that引导定语从句。故选C。
10. B 主句是is this the factory, 先行词是factory, 关系代词that/ which在定语从句中作visited的宾语。关系代词在定语从句中作宾语时可以省略。选项A，C，指代不明。选项D中where不可作定语从句的.宾语。故选B。
11. D 主句是I'll give you all, 先行词是不定代词all, 关系代词that在定语从句中作gave的直接宾语。关系代词在定语从句中作宾语时可以省略。A选项中当先行词是不定代词时，不用which引导的定语从句。B选项中what不引导定语从句。C选项中that作give 的直接宾语，指代不明。故选D。
12. B 先行词是the day指时间，关系副词在定语从句中作时间状语。Where, when, that不能在定语从句中作时间状语。故选B。
13. A 先行词是the reason指原因, 关系副词在定语从句中作原因状语。That, which, when不能在定语从句中作原因状语。故选A。
14. A 先行词是the doctor指人，关系代词that/whom在定语从句中作宾语。关系代词在定语从句中作宾语时可以省略，在这里省略了that或whom。Who在定语从句中不作宾语。Which引导的定语从句修饰的先行词指物，he不引导定语从句。故选A。
15. A 先行词the only thing指物，关系代词that在定语从句中作主语。当先行词被the only修饰时，只能用that引导定语从句。故选A。