I heard someone _____(knock /knocking) at the door just now .
I heard someone _____(knock /knocking) at the door just now .
横线上应填什么?为什么
横线上应填什么?为什么
英语人气:911 ℃时间:2019-10-08 09:29:04
优质解答
knocking 过去进行时 heard表过去 所以用ing形式
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