when 引导时间状语从句We ______ (hear) him singing in the next room when we passed.添heard 还是were hearing到底是哪个?

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when 引导时间状语从句
We ______ (hear) him singing in the next room when we passed.
添heard 还是were hearing
到底是哪个?

heard,因为heard主要表现bim singing,when we passed,pass并不是一个延续性动作,所以只能是heard.而were hearing 意思就不一样了.

个人认为应该是were hearing.

添 heard ,因为是路过听到,用过去时。

当然是HERAD
瞬时动词好像是不可以用进行时的哦