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At midnight,Peter was awakened by heavy knocks on

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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 on
heavy knocks on the door重重的敲门声
knock可以用复数
祝你学业进步!
再问: 那这句为什么 knock要用复数呢
再答: 按常理,嗯,敲门不只是敲一下。。我是这么理解的