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        1. 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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