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    科目： 来源：不详 题型：单选题

    This approach, ______ more expensive than the basic one, provides us with considerably more usage flexibility.
    A．asB．sinceC．whileD．if

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    科目： 来源：不详 题型：单选题

    I think you should complain, _____, of course, you are happy with the way things are.
    A．untilB．althoughC．whenD．unless

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    科目： 来源：不详 题型：单选题

    Mary and I have been close friends ______ we met each other 10 years ago.
    A．whenB．sinceC．untilD．as

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    科目： 来源：不详 题型：单选题

    They were surprised that a child should work out the problem____ they themselves could not.
    A．onceB．unlessC．whileD．if

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    科目： 来源：不详 题型：单选题

    _________ advertisements are of great help, I don’t think we should entirely rely on them.
    A．SinceB．WhileC．BecauseD．As

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    科目： 来源：不详 题型：单选题

    Try your best to help the people when they are in trouble, _______you will feel   pleased and happy.
    A．unlessB．orC．andD．But

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    科目： 来源：不详 题型：单选题

    Growing up ______ Micheal Jordan was in his prime, Beijing native Wu You knew what he wanted to do
    A．sinceB．whenC．untilD．before

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    科目： 来源：不详 题型：单选题

    ____ Helen’s knowledge and vocabulary expanded, she asked more and more questions.
    A．WhenB．WhileC．AsD．Before

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    科目： 来源：不详 题型：单选题

    —Won't you go shopping with your mother?
    —No.________ she promises to buy me a new sweater.
    A．Now thatB．If onlyC．As thoughD．Unless

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    科目： 来源：不详 题型：单选题

    He had his camera ready____ he saw something that would make a good picture.
    A．even ifB．if onlyC．in caseD．so that

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