Wind power is an ancient source of energy we may return in the near future.A. on whichB.

发布时间：2020-08-16 11:49:44


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

网友回答

A. on which
B. by which
(答案→)C. to which
D. from which
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