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

試題分析：unless除非，whether是否，if如果，是否，until直到。it’s widely known that眾所周知。句意：眾所周知，除非你努力工作否則你不會取得成功。故選A。
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