是we should not eat junk food （ ） A.too much B.much too C.too many D.much too WHY?

1、选A too much
这里too 用在much之前，说明“多”的程度，表示“太多”常用作形容词或副词，修饰不可数名词,junk food还是food是不可数名词,这里too much 用作eat的状语，说明eat的程度，吃的太多。
还可以这样用，如：we should not eat too much junk food.
2、B和D你打成一样的了，笔误吧，much too+形容词/副词 much用在too之前来加强语气，表示“实在太……非常……”
如：It is much too hot.
3、too many 表示“太多”，常用作形容词，修饰可数名词复数
如：I have too many things in my car.

A food 是不可数名词,不能用many.排除c.1. too much “太多”用作形容词,后接不可数名词. 如：too much water, too much snow, too much rain. 也可用作代词. 如：Don't eat too much. 别吃太多了.2. much...