When I was at school, I up very late, reading storybooks.
A. used to stay
B. was used to stay
C. used to staying
D. am used to staying
网友回答
(答案→)A. used to stay
B. was used to stay
C. used to staying
D. am used to staying
解析：考查短语搭配。used to do sth.过去常常做某事。句意：当我上学的时候，我常常看小说而睡得很迟。