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

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

D

解析試題分析:句意為:如果你不努力,你就會比別人落后。since:自從……以來,if:如果,until:直到……, unless:如果不、除非。根據(jù)語境可知應(yīng)選D。
考點:考查連詞。

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