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
解析:可联系答.案.网客服索取。