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1、used to do 表示过去常常做某事。
2、而现在往往不做了i used to get up early in the morning when i was still a hight school student.be used to doing 表示习惯于做某事i am used to eating rice now.be used to do表示...被用来做某事Pig Stem Cells to Be Used to Grow Human Organs?。
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