问题
选择题
It is not polite to enter others’ rooms knocking on the door.
A. by B. with C. without
答案
答案：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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It is not polite to enter others’ rooms knocking on the door.
A. by B. with C. without
答案：C
介词。根据句意：没有敲门就进入别人房间是不礼貌的。
