题目

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

提问时间：2020-06-25

答案

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）