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It’s widely known that you won’t achieve success _____ you work hard.
A.unlessB.whetherC.ifD.until
A

试题分析:unless除非,whether是否,if如果,是否,until直到。it’s widely known that众所周知。句意:众所周知,除非你努力工作否则你不会取得成功。故选A。
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