Apersonwhohassleptwellwillhaveaclearmindandworkefficie...
来源:语文精选馆 3.23W
问题详情:
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
知识点:连词
题型:选择题