问题描述：
Once a week he came to see me while l was in hospital.
Once a week he came to see me while l was in hospital.
Once a week did he come to see me while l was in hospital.
这两句哪句是正确的?
Once a week he came to see me while l was in hospital.
Once a week did he come to see me while l was in hospital.
这两句哪句是正确的?
问题解答：
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