【題目】 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】

試題分析：句意：一個(gè)晚上睡得好的人會(huì)有一個(gè)清晰和有效率的工作在白天，而一個(gè)睡眠不好的人很難在白天里集中精神。 A. unless 除非； B. while 然而；C. if如果；D. until 直到。根據(jù)句意可知選B。

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