the Internet is of great help I don’t think it’s a good idea to spend too much time on i

问题补充：

the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.

A. While

B. As

C. Because

D. If

答案：

(答案→)A. While

B. As

C. Because

D. If

解析：while引导让步状语从句符合句意，此处意思“尽管---”。