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 |
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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 |
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