it is to jump into a pool or go swimming in the sea when you visit Hawaii!A. What fun B

问题补充：

it is to jump into a pool or go swimming in the sea when you visit Hawaii!

A. What fun

BWhat a fun

CHow fun

D. How a fun

答案：

(答案→)A. What fun

B. What a fun

C. How fun

D. How a fun

解析：

试题分析:句意：当你去夏威夷的时候跳进池塘或者到大海里游泳是多么有趣的事情啊！感叹句的构成：What+（a/ an）+名词+主语+谓语；How +adj / adv/ v+主语+谓语，fun是不可数名词，选A。