Question

【题目】He doesn’t know_________ to hand in the homework. I think he may do it tomorrow.

A. where B. what C. which D. when

Answer 1

【答案】D

【解析】试题分析：句意：他不知道什么时候交作业。我认为他可能明天做。根据I think he may do it tomorrow可知，本题说的是交作业的时间。故选D。