The invention of_________ paper was a great contribution to________human civilization.
A．a(chǎn);aB．the;theC．/;/D．the;/
C
paper 物質(zhì)名詞，意為“紙”，前面不加冠詞；human civilization “人類文明”，習(xí)慣上前面也不用冠詞。
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