2. 职称英语
  3. I ______ housework when there was a knock at the door.A、didB、was doingC、am doi

I ______ housework when there was a knock at the door.A、didB、was doingC、am doi

游客2025-07-02  4
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，义因为主句动词do是延续性动词，所以主句时态应用过去进行时。
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