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    科目： 来源：不详 题型：单选题

    —Look! Someone ________ the floor.
    —Well, it wasn't me. I went shopping just now.
    A．had sweptB．has swept
    C．was sweepingD．is sweeping

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    科目： 来源：不详 题型：单选题

    —What's the matter with Philips?
    —Something must have happened to him. He left home three hours ago, but ________ at the party!
    A．didn't arriveB．isn't arriving
    C．hadn't arrivedD．hasn't arrived

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    科目： 来源：不详 题型：单选题

    Kate  ________    on her new novel, which is supposed to come out next month.
    A．was workingB．had worked
    C．will be workingD．has been working

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    科目： 来源：不详 题型：单选题

    Up to now, our society ________ with limited living space and a shortage of natural resources.
    A．has been challengedB．is being challenged
    C．is challengingD．has challenged

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    科目： 来源：不详 题型：单选题

    The house is dirty because it ________ since they moved out.
    A．doesn't cleanB．isn't cleaned
    C．hasn't cleanedD．hasn't been cleaned

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    科目： 来源：不详 题型：单选题

    I know little about the accident because not much ______ about it up to now.
    A．has saidB．has been saidC．had saidD．had been said

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    科目： 来源：不详 题型：单选题

    Barrack Obama __________ President of the United States since 2010.
    A．became aB．has become aC．has turnedD．has been

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    科目： 来源：不详 题型：单选题

    The famous reporter, who is said to go back to America next month, _____in China for almost twenty years.
    A．livedB．was livingC．has livedD．had lived

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    科目： 来源：不详 题型：单选题

    Minister Bill De Blasio     in office fewer than 48 hours when he came face to face with his biggest challenge in his life．
    A．has beenB．had beenC．would beD．is

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    科目： 来源：不详 题型：单选题

    Years of fighting have ______ the area ______.
    A．remained; in ruins B．left; in ruinsC．remained; in ruinD．left; in ruin

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