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【题目】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

【答案】A

【解析】试题分析:句意:值日的学生应该在上课前把黑板上的粉笔字擦干净。擦干净,擦掉用clean---off。故选A。

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