--Is your father a teacher?-well he .A. used toB. was used toC. used to beD. is used t

问题补充：

--Is your father a teacher?

---well, he .

A. used to

B. was used to

C. used to be

D. is used to be

答案：

A. used to

B. was used to

(答案→)C. used to be

D. is used to be

解析：C 考查used to的用法。“过去常常做……”used to do sth.,“习惯于......”be used to doing sth.“曾经是老师”, used to be中be的不能省略。