SUCH A GOOD NEWS为什么不对.

SUCH A GOOD NEWS为什么不对. such a good news 还是such good news that is good news 为什么不是"a" good news? Yesterday the teacher told us()news.A.a good B.such a good C news是不可数名词, 又为什么可以说a good news This is ( ) news.A.such a good B.a very good C.so good a D.s we have never heard such wonderful news.为什么这里不能用such a good news请问a good news行吗? It's so good for me that heard such a great news from you 表述 so和such的区别,用法是什么?是so good news 还是such good news? what a good news it is! what good news it is ! 那一句是正确的,为什么? 为什么是what good news.news不是看作单数吗前面为什么不加a呢