【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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