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He was playing tennis (yesterday at that time)填那个,为什么?

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He was playing tennis (yesterday at that time)填那个,为什么?
He was playing tennis( yesterday at that time)
He was playing tennis (yesterday at that time)填那个,为什么?
at that time
过去进行时,需要固定时间以确定正在进行的动作.yesterday是一个时间段(总不至于打一整天的球吧).
希望能提供帮助.
再问: 两个回答都很好,但你比较快