-Has Tommy finished his homework yet?-I have no idea; he it this morning.A. was doingB.

发布时间：2020-08-17 12:52:02

-Has Tommy finished his homework yet?
-I have no idea; he      it this morning.
A. was doing
B. had been doing
C. has done
D. did

网友回答

(答案→)A. was doing
B. had been doing
C. has done
D. did
解析：表示今天上午一直在做作业。
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