Question

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

Answer 1

C

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