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【题目】Look! The students _____ the classroom.

A. clean B. are cleaning C. are clean D. cleaning

【答案】B

【解析】

试题分析:句意:看,学生们在打扫教室。A. clean打扫。一般现在时形式;B. are cleaning正在打扫。现在进行时形式;C. are clean是干净的。后带有宾语,该用动词形式,不是用形容词形式。错。D. cleaning打扫,现在进行时由am, is, are+现在分词构成。错。由look可知,后面的动作能被看到,正在发生,句子用现在进行时态。故选B。

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