It is not polite to enter others’ rooms knocking on the door. A. by
题型：不详难度：来源：
It is not polite to enter others’ rooms knocking on the door.
A. by B. with C. without |
答案
| C |
解析
| 介词。根据句意：没有敲门就进入别人房间是不礼貌的。 |
举一反三
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A. with B. for C. on |
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