摘要： Wind power is an ancient source of energy we may return in the near future. A. on which B. by which C. to which D. from which 答案:C 考点:此处考查的是介词加疑问词引导从句 解析:考察介词+which的用法.=Wind power is an ancient source of energy which\that we may return to in the near future.

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