ago表示“从现在起的若干时间以前”,意思是“距今……以前”,需和过去时或过去进行时连用.
before泛指“从过去起的若干时间以前”,意思是“距过去某时……以前”“与其……（毋宁）”,常和完成时连用.
years ago与before two years的区别.
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