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We shouldn’t drink _______ we drive and we mustn’t drive if we’ve drunk.
A.unlessB.beforeC.untilD.while
B

试题分析:A. unless除非,B. before在…前面,C. until直到,D. while当…时候,句意:我们开车前不应该喝酒,如果喝酒了不能开车。所以选B。
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