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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】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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