knowledge 不可数 ,为啥a good knowledge?

knowledge 不可数 ,为啥a good knowledge? She always teach us a lot of knowledge.我想问问 不是说knowledge是不可数名词吗 可为啥不用lots of knowledge不可数还是可数 11题,knowledge不可数为什么可以加a knowledge 是可数还是不可数, fish是不可数n.为啥有a fish a knowledge 冠词选择I want an asssiant with __ knowledge of English and experience of office routine,答案上是a,可是knowledge不可数,为什么用a? 英语是不是每个不可数名词前加形容词都可以构成可数短语?像knowledge 可以变成 a good knowledge of... .为啥homework 是不可数名词! knowledge不是不可数吗,为什么有一道题目中加了aknowledge不是不可数吗,为什么It shows that _______ knowledge of first aid can make adifference中要填 a fancy dress中dress不可数吧,为啥课本里还有a fancy dress what knowledge还是what a knowledge 为什么knowledge is treasure treasure是不可数的 为什么knowledge is treasure treasure是不可数的 高中英语 It is well known that a good ( )of English is a must in international trade nowadays.knowledge是不可数名词,为什么前面可以用a have a knowledge a working knowledge of