【題目】He seldom stays up late at night, _______ he has too much work to do.

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

【答案】B

【解析】句意：他很少熬夜，除非有很多工作要做。A. if如果、是否；B. unless除非；C. until直到；D. while而、當(dāng)……時(shí)候。根據(jù)前后語句的關(guān)系可知，故選B。

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