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I______ housework when there was a knock at the door.A、didB、was doingC、am doin
I______ housework when there was a knock at the door.A、didB、was doingC、am doin
游客
2025-07-02
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问题
I______ housework when there was a knock at the door.
选项
A、did
B、was doing
C、am doing
答案
B
解析
本题考查动词时态。when引导的时间状语从句是一般过去时,主句也应用过去时,又因为主句动词do是延续性动词,所以主句时态应用过去进行时。
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