题目内容

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 我已经做了四个小时的家庭作业,但是我不确信我是否能在明天上交它.

解答 答案:B.根据语境我做了四个小时的作业,是持续到现在的动作,而现在完成时是表示从过去延续到现在的状态,而且现在还正在做家庭作业,故使用现在完成时的进行时B.have been doing.

点评 本题考查现在完成时的进行时.需要对句子语境分析,推测动作持续的时间.

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