His wife has left him, but he behaved _______ nothing had happened.

A．even though

B．as soon as

C．as though

D．as long as

参考给定材料的内容，请谈谈如何解决材料所反映的问题。要求：分条作答，简明扼要，所提建议或措施要有可操作性。不超过300字。