You will not succeed ______ you work har...

You will not succeed ______ you work harder.

A．if B．when C．unless D．because.

C 【解析】试题分析：根据语境可知此句的含义是你不会成功除非你努力工作。考查的是连词的基本用法，根据选择项的提示可知if引导的是条件状语从句，when引导的是时间状语从句unless引导的是让步状语从句because引导的是原因状语从句。A，B和D都不符合句意，故选C。考点：连词的基本用法

考点分析：

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