()it is to have a swim in hot summer

问题描述:

()it is to have a swim in hot summer
A:what a fun B:what fun C:how fun D:how a fun

fun是不可数名词
首先可排除c,d.因为how后面应该加形容词.
其次排除a.因为fun做名词时是不可数的.
选b.因为what后接名词