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【题目】You won’t succeed ________ you work hard.

A. ifB. becauseC. unlessD. and

【答案】C

【解析】

句意:除非你努力工作,否则你不会成功。考查连词辨析。A. if如果;B. because因为;C. unless除非;D. and和、并且。结合you work hard是条件,推测句意是:除非你努力工作,否则你不会成功。从句意来看,这里需要一个表假设的连词,说明后句是表假设的条件状语从句,结合选项,unless可以引导一个表假设的条件状语从句,意为"除非",相当于if条件状语从句的否定形式,即unless= if not,故答案选C。

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