used to do sth是“曾经做过某事”,过去时,但to后一般加动词原形；
be used是“被使用”,被动语态,be加动词过去分词；
be used to doing sth是“习惯于做某事”,to加动名词,即do加ing.
used to do,used to doing,be used to,be used to doing意思和区别
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