Do you remember there ___ a river here?A.used to be B.used to being C.was used to being D.was used to be 选什么,为什么?

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Do you remember there ___ a river here?A.used to be B.used to being C.was used to being D.was used to be 选什么,为什么?
Do you remember there ___ a river here?
A.used to be
B.used to being
C.was used to being
D.was used to be
选什么,为什么?

Do you remember there ___ a river here?A.used to be B.used to being C.was used to being D.was used to be 选什么,为什么?
A.
used to do“过去常常”,used to be“过去……”,这里意思是“你记得以前这里有条河吗?”