问题补充：
The Internet is a wonderful discovery,of great significance to people’s lives.
A. which I think is
B. which I think it is
C. as I think
D. as is I think
答案：
(答案→)A. which I think is
B. which I think it is
C. as I think
D. as is I think
解析：可联系答.案.网客服索取。
