单项选择题

For most people who have sleeping troubles, which of the following is the most usual cause

A．Their room is not cozy.
B．They are busy and occupied.
C．They have chronic disease.
D．They take a nap after lunc

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单项选择题

For most people who have sleeping troubles, which of the following is the most usual cause 您的浏览器不支持 audio 元素。