注意一下 这两个短语的意思是不一样的.be used to doing 是习惯做某事 use to是过去常常做某事（现在不坐了） be used to do是被用来做某事 be是系动词,否定式是be not,如果是do,否定才是don‘t.
英语搭配?be used to doing 的所有否定形式?didn't use to 对么?
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