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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

分类: 作业答案 • 2022-09-24 16:43:01

问题描述：

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

答

敲门---knock at door是固定用法,记住就行了.