Question

【题目】—Has Sam finished his homework today?

—I have no idea. He it this morning.

A. did B. has done

C. was doing D. had done

Answer 1

【答案】C

【解析】

句意：——山姆今天做完作业了吗？——我不知道。他今天早上在做。考查时态辨析题。this morning今天早上，用于过去时；根据句意语境，可知“今天早晨我看见他时他正在做作业，现在完没完不知道”，需用过去进行时，故选C。