The boys           when the teacher came in. So she was very angry．
A．were doing homework
B．were cleaning the classroom
C．were fighting
D．were learning English
C

試題分析：句意：當老師進來時那個男孩正在打架，所以老師非常生氣。when 引導的從句表示一個時間點，強調在這個時間點上另一個動作正在發(fā)生，故用過去進行時。根據(jù)句意，故選C。
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