翻译:进来前请敲门.Please______ _____the door before you come in.

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翻译:进来前请敲门.Please______ _____the door before you come in.

knock at

Please__knock____ _at____the door before you come in.

knock at

knock at

knock at
beat at/upon
rap on/at

knock at

knock at

Please knock on the door before you come in.

Knock at

knock at the door
knock on the door