问题描述：
don not have to do sth.don not need to do sth.need not do sth 三个词组有什么区别?
don not have to do sth.
don not need to do sth.
need not do sth
三个词组有什么区别?
don not have to do sth.
don not need to do sth.
need not do sth
三个词组有什么区别?
问题解答：
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