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    .The invention of_________ paper was a great contribution to________human civilization.

    A.a;a                            B.the;the                      C./;/                             D.the;/

    C


    解析:

    paper 物质名词，意为“纸”，前面不加冠词；human civilization “人类文明”，习惯上前面也不用冠词。

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