—The similarities between social networks are striking.
—That e as no surprise,because they are all products of the Internet.
A. should
B. shall
C. may
D. must
网友回答
A. should
B. shall
C. may
D. must
解析:句意:——各种社交网络惊人地相似。——那没有什么令人吃惊的,因为这些社交网络都是互联网的产物。should意为“应该”。