问题描述：
How many hours do you work a day?
可以写成 How many hours do you work in the day?
或 How many hours do you work in a day?
如果不可以,原因是什么?
可以写成 How many hours do you work in the day?
或 How many hours do you work in a day?
如果不可以,原因是什么?
问题解答：
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