She _____an English teacher,but now she's a writer Aused to be B used to C uses to be D was used toD was used to be 选什么

问题描述:

She _____an English teacher,but now she's a writer Aused to be B used to C uses to be D was used to
D was used to be 选什么

A.used to be
used to do sth是过去常常做某事,而现在不做了