问题
选择题
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
答案：C
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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
答案：C