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You will fall behind the others ______ you start to work hard.

A.since B.if C.until D.unless

D

解析试题分析:句意为:如果你不努力,你就会比别人落后。since:自从……以来,if:如果,until:直到……, unless:如果不、除非。根据语境可知应选D。
考点:考查连词。

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