i think someone is in .let's knock the door 这句话的knock为什么要改成knock at

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i think someone is in .let's knock the door 这句话的knock为什么要改成knock at
i think someone is in .let's knock the door 这句话的knock为什么要改成knock at

i think someone is in .let's knock the door 这句话的knock为什么要改成knock at
敲门---knock at door是固定用法,记住就行了.

在这里knock是不及物动词吧、因此+个at
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老弟,自己想吧,实在想不出来,毕竟可以问老师嘛!!!