Question

—The similarities between social networks are striking.
—That ________ come as no surprise，because they are all products of the Internet.

A．should

B．shall

C．may

D．must

Answer 1

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”。