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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

    【解析】

    试题分析：考查定语从句。本题中的介词to是从动词return后面移至关系代词which前面。句意：风能是一种古老的能量来源，在不久的未来我们就会重新使用它。Which指代前面的先行词an ancient source of energy作为介词to的宾语。动词return与介词to连用，故C正确。

    考点：考查定语从句中的介词

    点评：本题是把定语从句中的介词提前到关系代词的前面，定语从句的关系词前面的介词有三种来源：先行词的固定搭配，定语从句中的固定搭配，以及根据句子的意思选择的介词。

     

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