_________it is to play a game after schoolA What funB How funny

_________it is to play a game after schoolA What funB How funny
_________it is to play a game after school
A What fun
B How funny

_________it is to play a game after schoolA What funB How funny
A
1.fun是不可数名词,表"趣事",不能加冠词a;
2.从语法结构上来说,how funny的结构也没有错误.但是从含义上来说不符合句意.
funny adj.
有趣的,好笑的; 滑稽的; 不严肃的; 爱开玩笑的
[口]古怪的; 希奇的
有病的; 不舒服的
狡猾的; 欺骗性的; 可疑的
[美]粗野的,无礼的