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    科目： 来源：不详 题型：单选题

    Our country did a lot about the drunk-driving, and it took some time ____ the situation got better.
    A．afterB．sinceC．unlessD．before

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    科目： 来源：不详 题型：单选题

    You are a student_________ I am a student.
    A．butB．orC．andD．so

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    科目： 来源：不详 题型：单选题

    Turn on the TV or open a magazine ______ you will often see advertisements showing happy, balanced families.
    A．butB．tillC．andD．or

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    科目： 来源：不详 题型：单选题

    It has been 60 years ______ the two countries established diplomatic ties.
    A．that B．after C．from D．since

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    科目： 来源：不详 题型：单选题

    Paul had to write a history paper,  _____ he couldn’t find time to do it.
    A．butB．soC．becauseD．if

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    科目： 来源：不详 题型：单选题

    ___we do this today or tomorrow doesn’t make much difference.
    A．WhenB．WheneverC．WhetherD．If

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    科目： 来源：不详 题型：单选题

    The classroom is big enough for 25 students for normal use         you need more space for special activities.
    A．onceB．becauseC．ifD．unless

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    科目： 来源：不详 题型：单选题

    With some technical problems to be solved, it may be a while          the system is put into use.
    A．whenB．afterC．sinceD．before

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    科目： 来源：不详 题型：单选题

    The cost of living in Glasgow is among the lowest in Britain, ______ the quality of life is probably one of the highest.
    A．sinceB．whenC．asD．while

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    科目： 来源：不详 题型：单选题

    He tried his best to solve the problem, ______ difficult it was.
    A．howeverB．no matterC．whateverD．although

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