Great changes___in the city,and a lot of factories have been set _英语解答

Great changes___in the city,and a lot of factories have been set up.
是填has been happened还是have happened?为什么?

人气：389 ℃　时间：2020-04-30 09:51:53

解答

have happened（happen没有被动的.）
但应该用have taken place更好.
因为happen有偶然发生的意思.
城市已有很大变化,建起了很多工厂.