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薄荷红茶cheer
knock at [on] a door
拎拎同学
knock at the door
朱迪迪迪
knock the door
张轶群123
knockknock the door敲门
虎妞1989
knock at the door.To see the manager, knock at the door marked"private". 要见经理，请敲标有“私人的”字样的房间。When I heard the knock at the door, was the frightened out of my senses. 一听见有敲门声我就吓得六神无主。
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