When the teacher came into the classroom, the students ____ in groups.
A．workB．have workedC．were workingD．a(chǎn)re working
C

試題分析：句意：當(dāng)老師走進(jìn)教室的時(shí)候，學(xué)生正在分組學(xué)習(xí)。老師進(jìn)來(lái)這個(gè)動(dòng)作發(fā)生在過(guò)去，所以學(xué)生正在做某事，是過(guò)去的動(dòng)作，所以用過(guò)去進(jìn)行時(shí)態(tài)，故選C
點(diǎn)評(píng)：動(dòng)詞的時(shí)態(tài)是學(xué)習(xí)英語(yǔ)過(guò)程中非常重要的知識(shí)。而很多的題目，句中并沒(méi)有像本題一樣有明確的時(shí)間，很多要通過(guò)上下文的判斷得知。過(guò)去進(jìn)行時(shí)既可以表示動(dòng)作在過(guò)去的某個(gè)時(shí)間正在進(jìn)行，也可以表示動(dòng)作在過(guò)去的某一段時(shí)間一直在進(jìn)行，本題不難，平時(shí)加強(qiáng)記憶，理解即可。
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