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

解析試題分析：句意：當(dāng)老師進(jìn)來時(shí)那個(gè)男孩正在打架，所以老師非常生氣。when 引導(dǎo)的從句表示一個(gè)時(shí)間點(diǎn)，強(qiáng)調(diào)在這個(gè)時(shí)間點(diǎn)上另一個(gè)動(dòng)作正在發(fā)生，故用過去進(jìn)行時(shí)。根據(jù)句意，故選C。
考點(diǎn)：考查過去進(jìn)行時(shí)態(tài)的用法。

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