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    【题目】The computer is an invention of ______ great importance，______ invention that has changed people's way of life.
    A.the；the
    B.不填；an
    C.the；an
    D.不填；the

    【答案】B
    【解析】of great importance“很重要”；第二空后的invention为泛指，故其前用an；句意：电脑是一个非常重要的发明，也是一种已经改变了人们生活方式的发明。根据句意，故选B。

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