What () it is to stay in this ancient town for a couple of days

What () it is to stay in this ancient town for a couple of days in hot summer.
A、a great fun
B、great fun
C、great a fun
D、greatly funny
【正确答案】：B
【题目解析】：在炎热的夏天在这个古镇呆上几天真是太有趣了。这是感叹句，而fun是不可数名词。