Question

--- fun it is to have ice cream in hot summer

a\ what a
b\ how
c\ what
d\ how a
请说明理由好吗？

Answer 1

感叹句结构
what a/an +形容词+名词+主语+谓语
what +形容词+不可数名词+主语+谓语
what +形容词+复数名词+主语+谓语
How + 形容词/副词+主语+谓语.

答案是B how fun it is

在此fun是形容词，前面不能加不定冠词a

例句好
What a handsome boy he is!
What sunny weather we are having!
What beautiful flowers they are!
How carefully he is riding!
How beatiful the girl is!

Answer 2

how fun it is
how表示【多么的。。。】