knock on 敲物体的莫个具体部位
knock at 敲物体（没有特指部位）
a knock at the door中的介词常用at ,on不常用
因为敲门只是强调敲门这个整体
konck at与konck on的区别
2个回答
相关问题
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1.When I ____(konck) at his door .he was cooking.
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at hand与on hand的区别