I have a lot of books half of novels.A. whichB. thatC. whomD. them

问题补充：

I have a lot of books, half of novels.

A. which

B. that

C. whom

D. them

答案：

A. which

B. that

C. whom

(答案→)D. them

解析：许多同学认为先行词是 books, 介词后关系词用 which，从而将答案错选为 A。其实，逗号后面部分没有谓语动词，从而不成为句子，因此答案选 D，构成独立主格结构。