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
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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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