--Do you remember there _____ a river here?

--Do you remember there _____ a river here? --Of course, I often swam in it when I was young.A.used to beingB.used to beC.was used to beD.was used to being

B解析此题重点考查be used to doing sth和used to do sth 两个句型结构的区别和意义。前者是习惯做某事，后者表示过去常常做某事，现在不做了。

回答的不错