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。
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