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    My mother won't allow my father to drive he promises to give up drinking.

    A. unless B. since C. if D. after

    A 【解析】句意：我的妈妈不允许我的爸爸开车除非他承诺戒酒。unless除非，如果不，引导条件状语从句；since自从，引导时间状语从句；if如果，引导条件状语从句；after在…之后，引导时间状语从句。根据句意可知，这里说的是除非爸爸答应戒酒，否则妈妈就不让他开车，故应选A。
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