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We can’t take part in the competition __...

We cant take part in the competition ________ we get our student card.

A.beforeB. ifC. WhileD. as

 

A 【解析】 连词辨析。A.在……之前B.如果 C. 当……时D.由于。句意:在我们获得我们的学生证之前,我们不能参加比赛。故选A  
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