would have been more appropriate怎么理解?

would have been more appropriate怎么理解?
How customs vary around the world
It is not only inSouth Korea that greetings can offend (冒犯) others.A handshakecan also be a faux pas (失礼)in France if a kiss on the cheek (33) (be) more appropriate (恰当的).
In Japan,it is impolite not to bowlower than the other person when greeting.
In the UK and the US,the “okay” signis a positive gesture but in Greece and Turkey it is seen as very vulgar (粗俗的).
33题答案给的would have been 这里为什么变would have been虚拟语气?不能填would be 或者不用虚拟语气填is 为什么?