I _________ my homework last night when I heard a loud knock on the door.[ ]A. did B. was doing C. have done D. had done-初中英语-n多题

◎ 题干

I _________ my homework last night when I heard a loud knock on the door.

[ ]

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

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◎ 解析

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◎ 知识点

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