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    科目： 来源：不详 题型：单选题

    In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.
    A．makingB．madeC．to makeD．having made

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    科目： 来源：不详 题型：单选题

    Some scientists have questioned the theory ______ CO2 is causing dangerous global warming.
    A．whichB．whatC．thatD．why

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    科目： 来源：不详 题型：单选题

    As long as the laws of nature ______, there will be tornadoes.
    A．existB．are existingC．will existD．existed

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    科目： 来源：不详 题型：单选题

    ----What’s that smell?
    ---- I don’t know, but ______ it is, it’s terrible!
    A．whateverB．howeverC．whicheverD．wherever

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    科目： 来源：不详 题型：单选题

    ______you have got a chance, you might as well make full use of it.
    A．Now that B．After C．AlthoughD．As soon as

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    科目： 来源：不详 题型：单选题

    How can they learn anything _____ they spend all their spare time watching television?
    A．forB．whenC．whileD．because

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    科目： 来源：不详 题型：单选题

    _____________grades you get in this exam, you should never lose heart.
    A．No matter how B．What C．No matter whatD．Which

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    科目： 来源：不详 题型：单选题

    They will send kids to college      it takes, even if that means a huge amount of debt.
    A．whoeverB．howeverC．whateverD．whichever

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    科目： 来源：不详 题型：单选题

    —How about camping this weekend, just for a change?
    —OK, ______ you want.
    A．whicheverB．howeverC．whateverD．whoever

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    科目： 来源：不详 题型：单选题

              you are aware of the trick used in advertisements ,I don’t think you are eager to buy.
    A．WhetherB．Until C．ThoughD．Once

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