She___her hairstyle in her hometown before she came to Chongqing for a better job.

题目

She___her hairstyle in her hometown before she came to Chongqing for a better job.
A.would changex05B.has changedx05C.changedx05D.was changing
虽然之前有人问过也有人回复过,但是不能让我信服.
本人疑惑的地方在改变发型确实发生在来重庆找个好工作之前,有明显的先后顺序,为什么还要选changed呢?
Thank you so much~

答案