18．John _______ in his room when he heard screaming．（　　）
A．was studyingB．studied
C．had studiedD．has been studying

分析 當(dāng)約翰聽到尖叫時(shí)，他正在房間里學(xué)習(xí)．

解答 答案：A．根據(jù)when he heard screaming可知當(dāng)約翰聽到尖叫時(shí)，他正在房間里學(xué)習(xí)，所以前句用過去進(jìn)行時(shí)，答案是A．D項(xiàng)是現(xiàn)在完成進(jìn)行時(shí)，表示從過去開始一直到現(xiàn)在．

點(diǎn)評(píng) 考查過去進(jìn)行時(shí)．
現(xiàn)在完成進(jìn)行時(shí)表示從過去某一時(shí)間開始一直延續(xù)到現(xiàn)在的動(dòng)作．現(xiàn)在這個(gè)動(dòng)作可能剛剛終止，也可能仍在進(jìn)行．   
I have been sitting here all afternoon．
我在這兒坐了一下午了．

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