题目内容
---___________ a big factory near the river. Where is it now?
--It has been closed because it polluted the air.
A. It used to be B. There used to be
C. It is used to be D. There is used to be
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题目内容
---___________ a big factory near the river. Where is it now?
--It has been closed because it polluted the air.
A. It used to be B. There used to be
C. It is used to be D. There is used to be