The main types of social networking services are those that contain category places (such as former school year or classmates), means to connect with friends (usually with self-description pages), and a recommendation system linked to （） .
A、net
B、interests
C、others
D、trust
时间：2022-01-03 23:06关键词：
答案解析
D 解析：主流类型的社交网络通常包含一些诸如校友或同学等分类的场所，这些朋友通常会有自我介绍，而且社交网络也是一种基于（）关系的推荐系统A、网络B、兴趣C、其它D、信任
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