______ at the door before you come into the room.

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问题 ______ at the door before you come into the room.

选项 A、Hit
B、Knock
C、Touch
D、Strike

答案B

解析本题考查固定搭配。knock at the door“敲门”，是固定用法。句意为：你进房间之前请敲门。

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英语

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