used to 的用法有哪些

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第1个回答 2011-09-11

1.used to do sth=often did sth 过去常常做某事
eg：My father used to smoke a lot。
=My father often smoked a lot。
2. used to do 被用来·····
3.be/get used to do sth 习惯于做某事
4.use A to do B=.use A for doing B 用A来做B

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