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：我的媽媽不允許我的爸爸開車除非他承諾戒酒。unless除非，如果不，引導(dǎo)條件狀語從句；since自從，引導(dǎo)時(shí)間狀語從句；if如果，引導(dǎo)條件狀語從句；after在…之后，引導(dǎo)時(shí)間狀語從句。根據(jù)句意可知，這里說的是除非爸爸答應(yīng)戒酒，否則媽媽就不讓他開車，故應(yīng)選A。
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