— Has Sam finished his homework today, Anne?— I have no idea. But he ________ it this morning. [ ]A .didB. had doneC. was doingD. had done-高中英语-n多题

◎ 题干

— Has Sam finished his homework today, Anne?
— I have no idea. But he ________ it this morning.

[ ]

A .did
B. had done
C. was doing
D. had done

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◎ 解析

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◎ 知识点

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