used to do sth.

初中英语中used to do sth.句型的多样化综合拓展方式研究
初中英语中used to do sth.的多样化讲解策略
聚焦used to do sth.的用法
used to do sth., be used to do sth., be used to doing sth.用法区别
Chapter 11?–?Is that something we used to do in the 1970s?: The demise of ‘good work’ in the Volvo Corporation
be used to与used to do区别
Is that something we used to do in the 1970s?: The demise of ‘good work’ in the Volvo Corporation
涉及used to的三类重要考点
“used to"用法知多少?
used to的“秘密档案”