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
【正确答案】
C
【答案解析】
考查介词+which的用法。原句也可以写成：Wind power is an ancient source of energy which/that we may return to in the near future。
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