it was ,i should say ,very kind of you to come all the way to help them,but you didn`t have to.
为什么用“didn`t have to”?
人气：340 ℃ 时间：2019-12-14 19:08:54
解答
have to是必须
didn`t have to是不必要
didn`t 原句为过去式
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