这题考察定语从句的用法,介词+关系代词的用法,代词的选用可以根据先行词,也可以根据定语从句的动词搭配,这题定语从句中的turn 和to搭配,就是说,which前面加to,句意是:风能是一种古老的能源,我们在不久的将来可能会回头利用它。选A。
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