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

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

 

C

【解析】

試題分析：句意:除非你努力學(xué)習(xí)，否則你就追不上別人。until 直到…時候；after 在…之后；unless 除非；when 當(dāng)…時候。根據(jù)句意可知選C。

考點：考查連詞。

 

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