More and more advanced farm machines________, the agricultural production increased tremendously.

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问题 More and more advanced farm machines________, the agricultural production increased tremendously.

选项 A、using
B、having used
C、having been used
D、to have been finished

答案C

解析 本题考查独立主格结构。分析句子可知,后半句主谓完整,前半句应为独立主格结构,表原因。独立主格结构中的逻辑主语farm machines和动词use之间是被动关系,故首先排除A项和B项。不定式用在独立主格结构中表示将要发生的动作,显然农业机器不是只用一次的,故也排除D项。本题答案为C项。
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