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

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

C


解析:

paper 物質(zhì)名詞，意為“紙”，前面不加冠詞；human civilization “人類文明”，習慣上前面也不用冠詞。

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