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最佳答案：In the past,the expensive beaver skin was used to be treated as paper currency i
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最佳答案：I used to see the stars in the sky请采纳
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最佳答案：百度字典 谷歌字典
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最佳答案：Tom's brother used to make trouble ，but now he has changed.
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最佳答案：don't you remember me?are you used to playing piano?i am used to sleep with the
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最佳答案：My have a friend,whose name is Peter.He used to like to listen to some songs and
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最佳答案：To my surprise,he passed the exam.I used to play the violin.I agreed with Profes
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最佳答案：1.This is the river in which i used to swim.2.I've come to a conclusion.3.Compar
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最佳答案：1.My mom was afraid of darkness before.2.We once were good friends.3.He didn't l
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最佳答案：要看你的内容,一般作文都用的是过去时来叙述,主句是过去时,如果要叙述的内容的发生时间在主句之前,就用过去完成时.如果不是,就用过去时就可以了.多看一些英语作文书