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When cooking supper,______.

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When cooking supper,______.
A.there was a knock on the door B.someone was knocking at the door
C.we heard a knock on the door D.we heard someone is knocking at the door
不知道是选C还是D呢?
可不可以说一下为什么这样做呢?
When cooking supper,______.
c d要将is去掉 固定句型 hear doingsomething