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【题目】When the man downstairs knocked at the door, I_______.

A. am doing housework B. was doing housework

C. were doing housework D. am going to do housework

【答案】B

【解析】

句意:当楼下的人在敲门时,我正在做家务。当一个动作发生时,另一个动作正在发生,用进行时be doing,且根据knocked可知,用过去时,排除AD,主语为I,用was,故选B。

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