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He seldom stays up late at night, ______ necessary, to keep himself full of energy the next day.

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

B 【解析】句意:除非必要,否则他很少熬夜,以便第二天保持充沛的精力。考查连词辨析题。if如果,表条件;B. unless除非,表条件;C. until直到……才,表时间;D. while当……的时候,表时间。本句表条件,根据句意语境,可知if不合句意,故选B。
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