--- What sport do you like best?
--- Springboard diving (跳板跳水). to dive into water from a high board!
A. What a fun is it
B. How fun it is
C. How a fun is it
D. What fun it is
网友回答
A. What a fun is it
B. How fun it is
C. How a fun is it
(答案→)D. What fun it is
解析：考查感叹句：how修饰形容词或副词，what修饰名词，fun是不可数名词，不用冠词a，句意：--你最喜欢什么运动？--跳板跳水，从高台上跳到水里是多么好玩的事情啊。选D。