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— Has Sam finished his homework today?

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— Has Sam finished his homework today?
— I have no idea． He ______ it this morning.was doing.\x05A． did \x05B． has done\x05C． was doing \x05D． had done A为什么不对
— Has Sam finished his homework today?
过去进行时可以表示过去动作的持续,他今天早上一直在写作业.I have no idea,暗示不知道是否他完成了作业.
再问： A为什么不对
再答： 过去时表示在过去的某个时候发生的动作。过去进行时可以表示过去一直做，突出动作的持续。
再问： 过去时表示在过去的某个时候发生的动作 所以A也对
再答： A 肯定不对的。这类题在高考中也见过类似的。 I have no idea．语境很关键的。
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