the Internet is I do not think it is a good idea to spend too much time on it.A. When; g

问题补充：

the Internet is , I do not think it is a good idea to spend too much time on it.

A. When; greatly beneficial

B. As; a great benefit

C. While; of great benefit

D. Now; of no benefit

答案：

A. When; greatly beneficial

B. As; a great benefit

(答案→)C. While; of great benefit

D. Now; of no benefit

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