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    科目： 来源：不详 题型：单选题

    More historical buildings in the old town will fall down ________we try our best to protect them.
    A．ifB．sinceC．unlessD．in order that

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    科目： 来源：不详 题型：单选题

    – How long have you been collecting stamps?
    –         I was ten years old.
    A. Since                        B. When                 C. Because

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    科目： 来源：不详 题型：单选题

    ---We can’t get good grades ______ we study harder.
    ---I agree. That’s why I study so hard.
    A. because                  B. if                       C. unless

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    科目： 来源：不详 题型：单选题

    We still gave the boy another chance ______he made some mistakes.
    A．thoughB．whenC．unlessD．because

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    科目： 来源：不详 题型：单选题

            they are twins, they don’t look the same at all.
    A．BecauseB．ThoughC．AsD．Since

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    科目： 来源：不详 题型：单选题

    --- This history book is of great value.
    --- Exactly. ____________ can be enjoyed from it ____________ you have a deep understanding of it, however.
    A．Nothing; unlessB．Few; tillC．Something; untilD．Little; since

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    科目： 来源：不详 题型：单选题

    —How big the Green Expo Garden is!
    —It is. You will get los t easily        you have a map or a guide.
    A．unlessB．untilC．ifD．because

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    科目： 来源：不详 题型：单选题

    —Does your grandpa often walk the dog after supper?
    — Yes, _________ bad weather stops him.
    A．unlessB．becauseC．thoughD．since

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    科目： 来源：不详 题型：单选题

    —May I go swimming this afternoon?
    — I'm afraid not _______ you have finished your homework.
    A．ifB．unless C．becauseD．but

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    科目： 来源：不详 题型：单选题

    My uncle knew little about the famous film Queen        he saw it yesterday evening.
    A．ifB．andC．untilD．because

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