Thanks to invention of the Internet, people can stay at home chatting with friends onlin

Thanks to invention of the Internet, people can stay at home chatting with friends online.
A. the；the　
B. 不填；the
C. the；不填　
D. 不填；不填

A. the；the　B. 不填；the(答案→)C. the；不填　D. 不填；不填解析：考查冠词。笫一空，“因特网的发明”是特指概念，故前面加定冠词the；第二空，friends是复数，泛指朋友，故前面不加冠词。

就是这个解释