——What’s your mother?——She a teacher but now she is a doctor.A. used to beB. was used toC

问题补充：

——What’s your mother?

——She a teacher, but now she is a doctor.

A. used to be

B. was used to

C. use to be

D. is used to be

答案：

(答案→)A. used to be

B. was used to

C. use to be

D. is used to be

解析：根据后文答语内容, but now she is a doctor.可知答案为A,表示过去常常是···。