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Wind power is an ancient source of energy ____we may return in the near future.

A．on whichB．by which
C．to whichD．from which

C

解析試題分析：考查定語從句。本題中的介詞to是從動詞return后面移至關系代詞which前面。句意：風能是一種古老的能量來源，在不久的未來我們就會重新使用它。Which指代前面的先行詞an ancient source of energy作為介詞to的賓語。動詞return與介詞to連用，故C正確。
考點：考查定語從句中的介詞
點評：本題是把定語從句中的介詞提前到關系代詞的前面，定語從句的關系詞前面的介詞有三種來源：先行詞的固定搭配，定語從句中的固定搭配，以及根據句子的意思選擇的介詞。

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