问题补充：
---Do you remember there a river here?
--- Of course, I often swam in it when I was young.
A. used to being
B. used to be
C. was used to be
D. was used to being
答案：
A. used to being
(答案→)B. used to be
C. was used to be
D. was used to being
解析：there be 表示过去常常为there used to be,故选B
