Nearly a week passed before the girl was able to explain what happened to her.为什么用befor?

问题描述:

Nearly a week passed before the girl was able to explain what happened to her.为什么用befor?
为什么用befor,不用after?

这个女孩能够说出她发生了什么,一周是在这件事之前的
英语与中文翻译有些差异