please tell me if he knocks()the door.A.at B.in C.with D.by

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please tell me if he knocks()the door.A.at B.in C.with D.by
please tell me if he knocks()the door.A.at B.in C.with D.by

please tell me if he knocks()the door.A.at B.in C.with D.by
A knock at the door敲门.

A at

A knock at the door 敲门的意思

正确:A (knock at/on the door敲门)