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Look! The students _____ the classroom.

A.clean B.are cleaning
C.are cleanD.cleaning

B

解析试题分析:句意:看,学生们在打扫教室。根据句中提示词look可知此句时态应是现在进行时态,其基本结构是be+动词ing,所以选B。
考点:考查动词时态

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