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)做了四個小時的家庭作業(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)語境我做了四個小時的作業(yè)，是持續(xù)到現(xiàn)在的動作，而現(xiàn)在完成時是表示從過去延續(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)在完成時的進(jìn)行時B．have been doing．

點(diǎn)評 本題考查現(xiàn)在完成時的進(jìn)行時．需要對句子語境分析，推測動作持續(xù)的時間．

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