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You can’t catch up with others         you work hard.
A.untilB.afterC.unlessD.When
C

试题分析:
句意:除非你努力,否则你不可能赶上别人。 until直到---才---, after 在---之后,unless 除非,When当---时候。根据句意,应选用表示让步的连词unless。
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