【題目】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

【答案】B

【解析】句意：除非必要，否則他很少熬夜，以便第二天保持充沛的精力�？疾檫B詞辨析題。if如果，表?xiàng)l件；B. unless除非，表?xiàng)l件；C. until直到……才，表時(shí)間；D. while當(dāng)……的時(shí)候，表時(shí)間。本句表?xiàng)l件，根據(jù)句意語(yǔ)境，可知if不合句意，故選B。

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