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英语
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可以说there is a knock at the door吗
这里的介词是用at还是用on?
knock at和knock on有什么区别呀?
P.S.上课时老师讲的是用on,我不太确定,是真的这样吗?
人气：299 ℃ 时间：2019-08-31 17:17:13
解答
a knock at the door.敲门声.
a knock on the head.头上挨的一击.
你肯定混淆了
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