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【单选题】
Night-shift workers often find it difficult to sleep in the morning because ______.
A.their internal clock will not allow them to
B.they are often disturbed by morning visits
C.they are not trying hard enough to do so
D.they are too tired to go to sleep well
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根据网考网考试中心的答案统计,该试题:
53%的考友选择了A选项15%的考友选择了B选项15%的考友选择了C选项17%的考友选择了D选项