请教English问题1.oh,joh what a pleasant surprise you give me 为什么
请教English问题
1.oh,joh what a pleasant surprise you give me
为什么用what a pleasant surprise,surprise不是不可数名词吗?为什么又用a呢?
2.many people agree that a knowledge of english is a must in internationgal trade today.
knowledge不是不可数名词吗?为什么又用a呢?