the building is said()last monthto be pulled down;to have been pulled down;being pulled down;having been pulled down应该选哪个?我觉得应该选完成时的被动语态,可这里有两个完成时的被动语态,应该选那个?求讲解,这两个完成时的被动语态有什么用法区别?求讲解

the building is said()last month
to be pulled down;to have been pulled down;being pulled down;having been pulled down应该选哪个?我觉得应该选完成时的被动语态,可这里有两个完成时的被动语态,应该选那个?求讲解,这两个完成时的被动语态有什么用法区别?求讲解