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【题目】You won’t succeed ____ you work harder than before.

A.ifB.whetherC.unlessD.why

【答案】C

【解析】

句意:除非你比以前工作更努力,否则你将不会成功。

考查连词辨析。if如果,连词;whether是否,连词;unless除非,连词;why为什么,副词。根据句意“你将不会成功,_____你比以前工作更努力”可知工作更努力是取得成功的条件,用unless连接条件状语从句表示“除非,如果不”。故选C

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