【題目】Look! The students _____ the classroom.

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

【答案】B

【解析】試題分析:句意:看,學(xué)生們在打掃教室。A. clean打掃。一般現(xiàn)在時形式;B. are cleaning正在打掃,F(xiàn)在進行時形式;C. are clean是干凈的。后帶有賓語,該用動詞形式,不是用形容詞形式。錯。D. cleaning打掃,現(xiàn)在進行時由am, is, are+現(xiàn)在分詞構(gòu)成。錯。由look可知,后面的動作能被看到,正在發(fā)生,句子用現(xiàn)在進行時態(tài)。故選B。

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