---by the advances in technology,many farmers have set up wi

问题描述:

___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?
1个回答 分类:综合 2014-10-02

问题解答:

我来补答
对的,咱老师就是这样讲的
 
 
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