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    科目： 来源：不详 题型：单选题

    You shouldn’t accept a gift from a person _____ you don’t know him.
    A．untilB．unlessC．ifD．whether

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    科目： 来源：不详 题型：单选题

    Tony decided to study abroad _______ he knew he would meet many difficulties.
    A．as ifB．becauseC．unlessD．even if

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    科目： 来源：不详 题型：单选题

               we can’t remove our troubles in life forever, we can leave them behind when we are on vocation.
    A．WhenB．WhileC．UnlessD．Until

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    科目： 来源：不详 题型：单选题

               we are laid off, all of us will have to be retrained and improve ourselves.
    A．UnlessB．So thatC．UntilD．In case

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    科目： 来源：不详 题型：单选题

    _______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
    A．WhileB．UnlessC．WhenD．Because

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    科目： 来源：不详 题型：单选题

    You can go out, _________you promise to be back before 11 o'clock.
    A．as far asB．so far asC．whenD．as long as

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    科目： 来源：不详 题型：单选题

    The Premier says that bilateral relations will grow smoothly and steadily _____ both countries follow the principle contained in the joint documents.
    A．as far asB．thoughC．unlessD．as long as

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    科目： 来源：不详 题型：单选题

    ---Did you remember to give Jane the money you owned her?
    ---Yes, I gave it to her_________ I saw her.
    A．whileB．the momentC．suddenlyD．once

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    科目： 来源：不详 题型：单选题

    _____ these experiments were successfully completed would we think of
    going into humans.
    A．If only B．So that C．Only if D．Even if

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    科目： 来源：不详 题型：单选题

    ________ I heard the song by Taylor Swift, I was kept in its power.
    A．First timeB．For the first time
    C．The first timeD．At the first time

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