Question

My uncle has a lot of books, _______ are about computer science and technology.

A．most of them	B．most of that
C．most of which	D．and most of which

Answer 1

C

试题分析：考查定语从句。本题定语从句的先行词是a lot of books，定语从句中which指代先行词作为of的宾语。That不能放在介词的后面，them不能引导定语从句。D项中因为有了and说明是一个并列结构。which应该改为them。故C正确。
点评：定语从句的解题关键是分析句子成分，关系代词that, which, whose, whom, as， who在句中做主语，宾语，表语或者定语；where, why, how在句中做状语。要分析句子成分，看缺少什么成分，就选用相应的关系词。