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【题目】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

【答案】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。

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