used to do sth. 过去常常做某事,(意思现在不做了)
例: I used to get up early and take an hour's walk before breakfast.
我过去常常起床很早并且在早餐前散步一小时.
2.be used to doing sth / be used to sth . 是指习惯于做某事.(这里的to 是介词.)
例: She isn’t used to living in the countryside now.
她不习惯在乡下生活.
Are you used to the food here?
你习惯吃这儿的饭菜吗?
3.be used to do sth. 被用来做某事
例: Computers are used to do many things for people now.
现在计算机被用来做许多事情.
这道题如果选择A那就是,他被用来努力工作,选B的意思是,他习惯于刻苦的工作,work动词当名次.如有帮助欢迎采纳!