The book is not in the library.

问题描述:

The book is not in the library.
处填什么:A.that I need it B.I need it C.which I need it D.I need

选D.
这是一个定语从句,D选项中I need省略了先行代词that/which.
ABC选项均错误,原因是多了一个it.如果去掉it,前三个答案也正确.