题目

_____ by the advances in technology, many farmers have set up wind farms on their land. A. Being encouraged      B. Encouraging C. Encouraged           D. Having encouraged 答案： C 考查非谓语动词过去分词作原因状语的用法。分析句子可以看出，这是一个省略的原因状语从句，前后主语都是many farmers，由by the advances in technology，可知许多农民受到鼓舞，选C符合。  

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