问题补充:
This is the third book that he has written in the past five years, the first of I really enjoyed.
A. which
B. that
C. those
D. them
答案:
(答案→)A. which
B. that
C. those
D. them
解析:考查定语从句:句意:这是他在过去5年里面写的第三本书,我真的喜欢其中的第一本。这是由名词+of+关系代词构成的定语从句,修饰先行词book,所以选A。