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英语中used to…,be used to…,be used to do…,be used for/as…等用法容易混淆,现将其归纳对比,以助分辨与记忆:
In English, used to...,be used to...,be used to do...,be used for/as...,etc. The usage is confusing, and it is summarized and compared to help distinguish and remember: