There a lot of coal mines in the south but many of them have been closed or are be clos

问题补充：

There a lot of coal mines in the south, but many of them have been closed or are be closed.

A. use to having; about to

B. used to be; to

C. use to having; going to

D. used to be; supposed to

答案：

A. use to having; about to

(答案→)B. used to be; to

C. use to having; going to

D. used to be; supposed to

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