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

A.sinceB.ifC.untilD.unless

D

解析試題分析:句意:你會落在別人后面除非你開始努力工作。Since自從; if如果; until直到; unless除非。根據(jù)前后句句意可知該選D.
考點:考查連詞。

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