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 Apersonwhohassleptwellwillhaveaclearmindandworkefficie...

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 Apersonwhohassleptwellwillhaveaclearmindandworkefficie...

 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

【回答】

B

知識點:連詞

題型:選擇題

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