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You can’t catch up with others ______ you work very hard.

A. until B. after C. unless D. when

 

C

【解析】

试题分析:句意:除非你努力学习,否则你就追不上别人。until 直到…时候;after 在…之后;unless 除非;when 当…时候。根据句意可知选C。

考点:考查连词。

 

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