( )great fun it is to go to the amusement park in ( )fine weather.

问题描述:

( )great fun it is to go to the amusement park in ( )fine weather.
A,What a;such B,How;such a C,What;such

C.
fun 是不可数名词,不能加a,排除A
且What+形容词+不可数名词+it is是固定表达
weather也是不可数名词,不能用such a,只能用such.