knock at,knock on

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 08:31:02

knock at,knock on
What's the differance?

首先,是differences,拼错了...
开始正题：
knock at是敲门声
knock on是正在敲门,是一种动作

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