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You can not borrow books from the school library______you get your student card.
A,before    B,if       C,while     D,as
A

试题分析:句意,在你取得学生卡之前,你不能从学校图书馆借书。Before……之前 if 如果 while 然而 as 当……时,根据题意,故选A。
点评:解答这类题目,关键是理解题干意思以及各选项连词的意思,可以像数学中的代入法一样,依次把各个选项意思放入句子中进行比较,不难选出正确答案。
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