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    科目： 来源：不详 题型：单选题

    Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
    A．beforeB．as
    C．unlessD．in case

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    科目： 来源：不详 题型：单选题

    I will accept Guy coming with us, ________ he pays for his own meals.
    A．only ifB．so that
    C．ever sinceD．even though

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    科目： 来源：不详 题型：单选题

    ________ H7N9 is a deadly virus, it is still safe to eat thoroughly­cooked chicken.
    A．UntilB．While
    C．IfD．Since

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    科目： 来源：不详 题型：单选题

    The movie Life of Pi is so attractive that it holds the audience's curiosity ________ the story reaches the end.
    A．untilB．before
    C．afterD．when

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    科目： 来源：不详 题型：单选题

    Jerry has promised to keep the secret, so he won't tell anyone ________ asked to.
    A．untilB．now that
    C．unlessD．even though

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    科目： 来源：不详 题型：单选题

    It will be another 50 years ______ our country is expected to reach the level of a medium developed country.
    A．sinceB．before
    C．thatD．when

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    科目： 来源：不详 题型：单选题

    House prices vary from place to place and are usually high ________ there are famous schools.
    A．whenB．since
    C．whereD．whether

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    科目： 来源：不详 题型：单选题

    We can't wait any longer ________ we'll miss the plane.
    A．orB．but
    C．soD．yet

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    科目： 来源：不详 题型：单选题

    The new system needs to be in operation for five months ________ it can be updated.
    A．asB．while
    C．beforeD．once

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    科目： 来源：不详 题型：单选题

    ________ it is, the boy never seems to be able to finish it off.
    A．However interesting a book
    B．Whatever interesting a book
    C．How interesting a book
    D．What an interesting book

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