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【题目】A person who has slept well will have a clear mind and work efficiently in the daytime ______ people with sleep disorders find it difficult to concentrate during the day.

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

【答案】B

【解析】

试题分析:考查副词。句意:一个晚上睡得好的人会有一个清晰和有效率的工作在白天,而一个睡眠不好的人很难在白天里集中精神。 A. unless 除非; B. while 然而;C. if如果;D. until 直到。根据句意可知选B。

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