题目内容
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
解析试题分析：句意：当老师进来时那个男孩正在打架，所以老师非常生气。when 引导的从句表示一个时间点，强调在这个时间点上另一个动作正在发生，故用过去进行时。根据句意，故选C。
考点：考查过去进行时态的用法。
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