At midnight,Peter was awakened by heavy knocks onthe door.这句中knock为什么加s

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Atmidnight,Peterwasawakenedbyheavyknocksonthedoor.这句中knock为什么加sAtmidnight,Peterwasawakenedbyheavykno

At midnight,Peter was awakened by heavy knocks onthe door.这句中knock为什么加s
At midnight,Peter was awakened by heavy knocks on
the door.
这句中knock为什么加s

At midnight,Peter was awakened by heavy knocks onthe door.这句中knock为什么加s
heavy knocks on the door重重的敲门声
knock可以用复数
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knock=敲门声，是名词。加s表示多次敲门声。