【題目】Look! The students _____ the classroom.
A.clean
B.are cleaning
C.are clean
D.cleaning

【答案】B
【解析】句意:看,學(xué)生們?cè)诖驋呓淌。A. clean 打掃。一般現(xiàn)在時(shí)形式;B. are cleaning 正在打掃,F(xiàn)在進(jìn)行時(shí)形式;C. are clean 是干凈的。后帶有賓語(yǔ),該用動(dòng)詞形式,不是用形容詞形式。錯(cuò)。D. cleaning 打掃,現(xiàn)在進(jìn)行時(shí)由am, is , are+現(xiàn)在分詞構(gòu)成。錯(cuò)。由look可知,后面的動(dòng)作能被看到,正在發(fā)生,句子用現(xiàn)在進(jìn)行時(shí)態(tài)。故選B.

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