used to be

Used to be used to be used as .be used to .be used for .be used to doing.used t be used for be used to be used from区别 关于used to be used to be used to be翻译 to be used I used to be be used to used to／be used to／be used for的区别 be used for /be used to /used to区别~ 用used to ,get used to ,be used for ,be used as ,be used by 的