There used to a clean river in the village but now it’s dirty.A. beB. beingC. haveD. ha

问题补充：

There used to a clean river in the village, but now it’s dirty.

A. be

B. being

C. have

D. having

答案：

(答案→)A. be

B. being

C. have

D. having

解析：此题考查there be结构的一般过去时的基本结构。There were/was或there used to be