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Look! The students _____ the classroom.

A.cleanB.are cleaning
C.are cleanD.cleaning

B

解析试题分析:句意:看!这些学生们正在打扫教室。分析:考查现在进行时的用法,构成:be doing,主语是第三人称复数,因此be 动词用are.故选 B
考点:考查动词的用法。

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