This is the book we are looking for. A. whoB. whichC. whoseD. Whom

问题补充：

This is the book we are looking for.

A. who

B. which

C. whose

D. Whom

答案：

A. who

(答案→)B. which

C. whose

D. Whom

解析：此题重点考查定语从句的引导词，因其先行词为the book表示物品，在从句中做宾语故用引导词that或which。