题目内容
【题目】The typhoon _______ when I _______ some cleaning,
A. starts; was doing B. started; was doing C. starts; were doing D. was starting; was doing
【答案】B
【解析】句意：当我在打扫卫生时，台风来了。start开始，动词，一般不用进行时态，从句的主语是I，所以用was doing；根据前后一致性，都用过去时态；故选B
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