Question

--Is your father a teacher? 

--well, he _______.

1. A.
   used to
2. B.
   was used to
3. C.
   used to be
4. D.
   is used to be

Answer 1

C
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。