They told me that he had left 2 hours before

问题描述:

They told me that he had left 2 hours before
能否用ago?ago和befor好像都是在……以前.可否 2 hours ago.
麻烦大家在不忙时候解答.

不可以,给你简单解释一下两者的区别.*ago 指以现在为起点,往前(以前)推:2 hours ago 两小时以前(从现在开始算)*before从过去某一时间点为起点,往前(以前)推:They told me that he had left 2 hours before ...