15．When Jim's mother came in，he _______ his homework．（　�。�
A．is doingB．has doneC．was doing

分析 當Jim的媽媽進來時，他正在做他的作業(yè)．

解答 答案：C 根據(jù)時間狀語when Jim's mother came in，可知做作業(yè)這一動作發(fā)生在過去的一個時間點，故應該用過去進行時（was/were+doing），A為現(xiàn)在進行時；B為現(xiàn)在完成時．故選C．

點評 本題考查過去進行時．根據(jù)when引導的時間狀語從句是做題的關(guān)鍵．

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