— Has Sam finished his homework today?　　— I have no idea. He it this morning.　　A. didB. w

发布时间：2020-08-16 19:05:28

— Has Sam finished his homework today?　　
— I have no idea. He      it this morning.　　
A. did
B. was doing
C. has done
D. had done

网友回答

A. did
(答案→)B. was doing
C. has done
D. had done
解析：考查动词的时态。根据this morning可知句子要用一般过去时态的某种形式，且表明今天早晨我看见他时他正在做作业，所以选B。
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