wouldn't it be _____ wonderful world if all nations lived in ___ peace with one another?

问题描述:

wouldn't it be _____ wonderful world if all nations lived in ___ peace with one another?
a:a,/ B:the,/ C:a,the D:the,the
选哪个?为什么?

A.
a wonderful world 一个美好的世界,单数可数
live in peace 和平共处 peace是抽象名词,无单复数 in peace:在和平状态下
如果所有的国家都和平共处,这个世界不是会很美好吗?