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    We shouldn’t drink _______ we drive and we mustn’t drive if we’ve drunk.

    A．unless B．before C．until D．while

    B

    解析试题分析：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。
    考点：考查连词

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