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    【题目】I ________ my homework for four hours, but I am not sure whether I can hand it in tomorrow.
    A.have done
    B.have been doing
    C.had been doing
    D.had done

    【答案】B
    【解析】考查时态。句意：四个小时以来，我一直都在做家庭作业，但是我不确信我是否能在明天上交它。现在完成进行时通常表示过去发生的事情延续到现在，而且还在继续发生，强调事情的延续性和反复性。故B正确。

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