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

分析 當(dāng)Jim的媽媽進(jìn)來時(shí)，他正在做他的作業(yè)．

解答 答案：C 根據(jù)時(shí)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(gè)時(shí)間點(diǎn)，故應(yīng)該用過去進(jìn)行時(shí)（was/were+doing），A為現(xiàn)在進(jìn)行時(shí)；B為現(xiàn)在完成時(shí)．故選C．

點(diǎn)評 本題考查過去進(jìn)行時(shí)．根據(jù)when引導(dǎo)的時(shí)間狀語從句是做題的關(guān)鍵．

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