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

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：AB选项表述不完整，C表示曾经是，D表示习惯了，根据题意选C。