When the teacher came into the classroom, the students ____ in groups.

A．workB．have workedC．were workingD．a(chǎn)re working

C

解析試題分析：句意：當老師走進教室的時候，學生正在分組學習。老師進來這個動作發(fā)生在過去，所以學生正在做某事，是過去的動作，所以用過去進行時態(tài)，故選C
考點：時態(tài)
點評：動詞的時態(tài)是學習英語過程中非常重要的知識。而很多的題目，句中并沒有像本題一樣有明確的時間，很多要通過上下文的判斷得知。過去進行時既可以表示動作在過去的某個時間正在進行，也可以表示動作在過去的某一段時間一直在進行，本題不難，平時加強記憶，理解即可。

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