Mother us stories when we were children.
A. was used to tell
B. is used to telling
C. used to tell
D. used to telling
网友回答
A. was used to tell
B. is used to telling
(答案→)C. used to tell
D. used to telling
解析： used to do“过去（常）做某事”，be used to doing“习惯于做某事”。