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    科目： 来源：不详 题型：单选题

    The first few years in the 21st century ______ the rapid rise of China as a world economic power.
    A．witnessB．has witnessedC．will witness D．have witnessed

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    科目： 来源：不详 题型：单选题

    With more forests being destroyed in that area, huge quantities of land _______ deserts each year.
    A．has been turned into B．had been turned into
    C．is being turned into D．are being turned into

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    科目： 来源：不详 题型：单选题

    The new dictionaries are very useful. They _______ well and _______ already.
    A．sell; have been sold out
    B．sold; had sold out
    C．sell; sell out
    D．are sold; have been sold out

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    科目： 来源：不详 题型：单选题

    The new generation of computers, with artificial intelligence, _______and perfected now.
    A．are being developedB．have developed
    C．developedD．will develop

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    科目： 来源：不详 题型：单选题

    ---John, why are you so upset?
    ---I­­­      my cell phone all morning but it is nowhere to be found.
    A．am looking forB．have looked for
    C．have been looking forD．had looked for

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    科目： 来源：不详 题型：单选题

    Sun Yang, a young Chinese swimming talent,       several gold medals before the 2012 London Olympics.
    A．wonB．has wonC．had wonD．were to win

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    科目： 来源：不详 题型：单选题

    I will visit you if Father ______ me.
    A．let B．lets C．is letting D．will let

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    科目： 来源：不详 题型：单选题

    My brother wants to work in the factory which _________ now.
    A．is buildingB．has been builtC．is being builtD．is to be built

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    科目： 来源：不详 题型：单选题

    They are living with their parents for the moment because their own house _________.
    A．is being builtB．has been rebuiltC．is rebuiltD．has rebuilt

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    科目： 来源：不详 题型：单选题

    All the scientific evidence ______ that increasing use of carbon dioxide ______ the rise of the earth’s temperature.
    A．show; result inB．shows; result from
    C．shows; results inD．shows; results from

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