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There ____a lot of coal mines in the south,but many of them

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There ____a lot of coal mines in the south,but many of them have been closed or
There used to be a lot of coal mines in the south,but many of them have been closed or are _____be closed.
横线上可以填about to ,going to,to,supposed to中的哪些,为什么
There ____a lot of coal mines in the south,but many of them
这几个都可以,因为中间是用 or 做连词:
have been closed 已经被关闭了
和下列几个都可以存在 “or" 的并列关系
are about to be closed 就快要被关闭了
are going to be closed 即将会被关闭
are to be closed 将会被关闭
are supposed to be closed 应该要被关闭了(还没轮到,或有人包庇)