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Look! The students _____ the classroom.

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

B

解析試題分析:句意:看,學生們在打掃教室。根據句中提示詞look可知此句時態應是現在進行時態,其基本結構是be+動詞ing,所以選B。
考點:考查動詞時態

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