4 This is the last factory _______ he used to work at, many workers of _______ still have a good relationship with him.
A. that; it B. which; whom C. that; which D. which; that
11 He is not _______ he used to be.
A. what B. which C. that D. as
答案选A。what引导表语从句。What在此相当于the person that。
19 He answered with such simplicity _______ he asked.
A. like B. as C. which D. unlike
答案选as。注意such…as搭配。As 用作关系代词引导限制性定语从句时，通常与such, as, the same 等搭配。
25 They elected him president, _______ he long wanted to be.
A. who B. whom C. that D. which
29 Who _______ knows him would trust him.
A. whom B. that C. who D. which
答案选B。由于先行词是who，为避免重复，故用that来引导。另外，我想这个句子应该是疑问句吧，即句末应有问号：Who _______ knows him would trust him? 句意为：认识他的人有谁会信任他呢？
比较：Everyone that knows him would trust him. 认识他的每个人都信任他。
若对主语everyone提问，则为：Who that knows him would trust him?
30 You may borrow any book _______.
A. which you interest B. that you are interested C. that interests you D. which interests you
32 You may stay _______ you like.
A. for how long B. for which long C. at which D. where
34 This is the largest clock in the world, _______ the minute hand is 6 meters long.
A. where B. of which C. whose D. which
答案选B。of which the minute hand 相当于whose minute hand。
35 There is no child _______ loves his parents.
A. but B. that C. who D. as
答案选A。but 在此用作关系代词，相当于who (that)…not。句意为：没有不爱自己父母的孩子。又如：
There is no tree but bears some fruit. 没有树不结果。
There are very few but admire his talents. 很少人不佩服他的才能。
Surely there isn’t a mother but faces this problem. 肯定的，没有一个母亲不面临这个问题。
36 The building over there is a library, _______ is our library.
A. on the east of which B. to the east of it C. to the east of that D. east of which
答案选D。east of which引导定语从句，在意义上相当于and east of it。其实此题也可填to the east of which（即把A项中的on改为to也可以，把B项中的it改为which也可以，把C项中的that改为which也可以）。