It is impossible for little children to do much work in a short time. A so;so B so; such C

问题补充：

It is impossible for little children to do much work in a short time.

A so;so B so; such C such; such D such; so

答案：

解析：such修饰后面的名词,so修饰后面的形容词或副词,中心是children,后面中心是much,所以选D,这样的小孩子不可能在短时间内做如此多的工作.