题目内容
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
C
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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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 |