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He seldom stays up late at night, necess...

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

A. if  B. unless C. since D. though

 

B 【解析】 试题分析:句意:除非有必要,否则为了第二 天能精力充沛,他很少熬夜很晚。if意为 “如果”;until意为“直到”;though意为 “虽然”。unless意 为“除非”,相当于if not ,符合句意。故选B。 考点:考查连词的用法。  
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