3．I ________ my homework for four hours，but I am not sure whether I
can hand it in tomorrow．（　�。�
A．have doneB．have been doingC．had been doingD．had done

分析 我已經(jīng)做了四個(gè)小時(shí)的家庭作業(yè)，但是我不確信我是否能在明天上交它．

解答 答案：B．根據(jù)語境我做了四個(gè)小時(shí)的作業(yè)，是持續(xù)到現(xiàn)在的動(dòng)作，而現(xiàn)在完成時(shí)是表示從過去延續(xù)到現(xiàn)在的狀態(tài)，而且現(xiàn)在還正在做家庭作業(yè)，故使用現(xiàn)在完成時(shí)的進(jìn)行時(shí)B．have been doing．

點(diǎn)評(píng) 本題考查現(xiàn)在完成時(shí)的進(jìn)行時(shí)．需要對(duì)句子語境分析，推測(cè)動(dòng)作持續(xù)的時(shí)間．

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