it is to jump into the river to swim in summer!A. What a funB. What funC. How funD. How fu

问题补充：

it is to jump into the river to swim in summer!

A. What a fun

B. What fun

C. How fun

D. How funny

答案：

A. What a fun

(答案→)B. What fun

C. How fun

D. How funny

解析：考查感叹句。Fun是不可数名词，排除A；中心词是名词时，用what引导感叹句。在夏天跳到河里去游泳是件多么有趣的事情啊！故选B。