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She won’t lose weight______ she keeps a diet and takes exercise every day.
A.unlessB.ifC.becauseD.since
A

试题分析:句意:除非她每天节食,并且做运动,否则她不会减肥。本题考查连词,unless 除非,如果不,引导条件状语从句;if 如果,引导条件状语从句;because 因为,引导原因状语从句;since 自从,表示时间;或既然,表示原因。根据句意可知选A。
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