The student on duty are supposed to _________ the chalk _________ the blackboard before class. A.cle...
2022-07-28 11:05:06 210次 人教新目标英语九年级全册Unit 10 You’re supposed to shake hands Section B (1a1d)课时练习 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
The student on duty are supposed to _________ the chalk _________ the blackboard before class.
A.clean…off B.clean...up C.clean…out D.clean…away
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