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题目内容
（乐山师范学院综合英语）
According to the author, we cannot sleep well when we ______.
A. are worrying about our safety
B. are overworked
C. are in a tent
D. are away from home
A. are worrying about our safety
B. are overworked
C. are in a tent
D. are away from home
参考答案
