Look! The students _____ the classroom.

A．clean B．a(chǎn)re cleaning
C．a(chǎn)re cleanD．cleaning

B

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

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