Before you enter the room, you need to knock ________ the door politely. A. for B. about C. with D. ...
2022-10-15 00:26:47 18次 人教新目标九年级英语全册 Unit 10单元测试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Before you enter the room, you need to knock ________ the door politely.
A. for B. about C. with D. at
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