it is to go swimming in such hot weather!A. What great funB. What a great funC. How great

问题补充：

it is to go swimming in such hot weather!

A. What great fun

B. What a great fun

C. How great fun

D. How great a fun

答案：

(答案→)A. What great fun

B. What a great fun

C. How great fun

D. How great a fun

解析：考查感叹句用法。当后面是名词或者名词性短语的时候，使用what引导起感叹句；当后面是形容词或者副词的时候，使用how引导起感叹句。本句的fun是一个不可数名词，故使用what进行感叹。句意：在如此炎热的天气里去游泳是多么快乐的事情啊！故A正确。