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We can’t take part in the competition ________ we get our student card.
A.beforeB.ifC.WhileD.as
A
考察连词。A.在……之前  B. 如果 C. 当……时 D.由于。句意:在我们拿到学生卡之前,我们不能参加这场比赛。故选A。
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