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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)車前不應(yīng)該喝酒，如果喝酒了不能開(kāi)車。所以選B。
考點(diǎn)：考查連詞

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