这个大题怎么写，求学霸帮忙，必采纳
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1 Did he have to go to the library?
2 How long have you had to stay there?
3 I don't have to go to the station early.
4 What must he do?
2 How long have you had to stay there?
3 I don't have to go to the station early.
4 What must he do?
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