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    科目： 来源：不详 题型：单选题

    It is well understood _____ controls the flow of carbon dioxide in and out the atmosphere today.
    A．thatB．whenC．whatD．how

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    科目： 来源：不详 题型：单选题

    No sooner had we reached the top of the hill _____ we all sat down to rest.
    A．whenB．thenC．thanD．until

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    科目： 来源：不详 题型：单选题

    The reason for the party was _____ it was Sue’s birthday.
    A．becauseB．thatC．because ofD．due to

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    科目： 来源：不详 题型：单选题

    _____ quite recently, most mothers in Britain did not take paid work outside the home.
    A．Before B．Until C．From D．Since

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    科目： 来源：不详 题型：单选题

    I have kept that portrait _____ I can see it every day, as it always reminds me of my university days in London.
    A．which B．where C．whether D．when

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    科目： 来源：不详 题型：单选题

    You see the lightning _____ it happens, but you hear the thunder later.
    A．the instantB．for an instantC．on the instantD．in an instant

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    科目： 来源：不详 题型：单选题

    They decided to chase the cow away _____ it did more damage.
    A．unlessB．untilC．beforeD．although

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    科目： 来源：不详 题型：单选题

    _____ he works hard, I don’t mind when he finishes the experiment.
    A．As soon asB．As well asC．So far asD．So long as

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    科目： 来源：不详 题型：单选题

    _____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
    A．Now thatB．Ever sinceC．So thatD．As long as

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    科目： 来源：不详 题型：单选题

    _____ or not we had a baby, we couldn’t survive only on my salary.
    A．AsB．EvenC．HoweverD．Whether

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