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

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A. Being encouraged
B. Encouraging
(答案→)C. Encouraged
D. Having encouraged
解析：
C。根据句意和空格后的介词by短语可知，空格处应填一个表被动意义的选项，故可排除B和D；而选项A为现在分词的被动式，除表示被动外还表示动作在进行，与句意不符，故也排除。