It is not polite to enter others’ rooms knocking on the door. A. by B. with C. without 题目和参考答案——青夏教育精英家教网——

题目内容

It is not polite to enter others’ rooms knocking on the door.
A. by B. with C. without

C

介词。根据句意：没有敲门就进入别人房间是不礼貌的。

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