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    科目： 来源：不详 题型：单选题

    Don't try to get off the bus ____ it has stopped.
    A．whileB．asC．sinceD．before

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    科目： 来源：不详 题型：单选题

    I'll come and see you _____ I go to the countryside.
    A．whileB．when .C．as soon asD．before

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    科目： 来源：不详 题型：单选题

    ___ he came to study in the university, he has made much progress in the study of English.
    A．WhileB．WhenC．SinceD．After

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    科目： 来源：不详 题型：单选题

    Things have changed a lot ____ I wrote to you last time.
    A．whenB．sinceC．asD．before

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    科目： 来源：不详 题型：单选题

    I'd like to go swimming ____ the water is not too cold.
    A．forB．unlessC．ifD．whether

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    科目： 来源：不详 题型：单选题

    Difficulties are nothing ___ we are not afraid of them.
    A．forB．asC．ifD．whether

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    科目： 来源：不详 题型：单选题

    The doctor will not perform the operation ___ it is absolutely necessary.
    A．whenB．ifC．forD．unless

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    科目： 来源：不详 题型：单选题

    Go back ___ you came from.   
    A．untilB．whereC．whichD．when

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    科目： 来源：不详 题型：单选题

    He lay ___ the grass was the thickest.  
    A．whereB．whenC．thatD．after

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    科目： 来源：不详 题型：单选题

    You will find friendly people ___ you go in China.
    A．whereB．andC．whereverD．so

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