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

試題分析：A. unless除非，B. before在…前面，C. until直到，D. while當(dāng)…時(shí)候，句意：我們開(kāi)車(chē)前不應(yīng)該喝酒，如果喝酒了不能開(kāi)車(chē)。所以選B。
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