from 400 years ago和about 400 years ago 区别
from 400 years ago和about 400 years ago 区别
ten years ago 和 a decade ago的区别
About ten years ago,he graduate from a famous university.
ten years before 和ten years ago 有什么区别?
in a few years和 after years ago的区别
many years before和many years ago的区别
five years before 用法和five years ago的区别
two years ago 和for two years有什么区别
ten years before和ten years ago的区别?
ten years ago和in ten years ago有什么区别
a few years ago与 few years ago的区别和对错
it was about 100 years ago