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    【题目】You can't borrow books from the school library __________ you get your student card.

    A. before

    B. if

    C. while

    D. as

    【答案】A

    【解析】句意：在你没有得到学生证之前不能在学校图书馆借书。before在……之前；if如果；while当……时候，然而；as随着，因为。before引导的状语从句是常考的知识点。before还可表示“……才……”，“还未来得及……”。

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