There uesd to be a lot of chemical plants in the south,but many of them have been closed or are ?be closed. A to B suppo
问题描述：
There uesd to be a lot of chemical plants in the south,but many of them have been closed or are ?be closed. A to B supposed to
说明原因
答
选A,to be表示将会发生的,supposed to是应该,假设的意思,虽然语法上没有错误,但意思上说不通