Question

The Internet is a wonderful discovery, ___of great significance to people’s lives.

A．as is I think.

B．which think it is

C．which I think is

D．as I think

Answer 1

C

考查定语从句，根据句子结构可知，该句为定于从句，先行词是前面一个句子，在从句中作is的主语，I think是插入语，
句意为，英特网是一个伟大的发明，它对人们的生活非常重要。