【题目】 She asked me _______ I had returned the books to the library, and I admitted that I hadn't.
A.when
B.where
C.whether
D.what

【答案】C
【解析】句意：她问我是否把书还给图书馆了，我承认我没有。when何时；where哪里；whether是否；what什么。根据后半句可知选C。