what a wonderful time to eat breakfast!
how wonderful a time / it is to eat breakfast
what+ 名词 （+ it is ） a 和 wonderful 是用来修饰time的 相当于 such a wonderful time
how +形容词 （+ it is ） 相当于 so wonderful the time
what a wonderful time to eat breakfast!
how wonderful a time / it is to eat breakfast
what+ 名词 （+ it is ） a 和 wonderful 是用来修饰time的 相当于 such a wonderful time
how +形容词 （+ it is ） 相当于 so wonderful the time