___by the advances in technology,many farmers have set up wind farms on their land.

题目

___by the advances in technology,many farmers have set up wind farms on their land.
我知道是被动应该填encouraged,那么选项中有一个having encouraged 是不是如果在中间加一个been改成having been encouraged就正确了呢?

答案

对的,咱老师就是这样讲的