以前曾经

1.
at one time
高中英语会考必记词汇 - 豆丁网 ... at least 至少 42 at one time 以前,曾经 43 at present 现在,目前 44 ...
www.docin.com|Based on 553 pages
2.
3.
once
one's和once有什么区别呢?? - 已解决 - 搜搜问问 ... once 一次,曾经 once 以前,曾经;一次 ...
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Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard