( )it is to jump into a pool or go swimming in a river in summer!a,what a fun b,what fun c,how funny d,how a fun

问题描述:

( )it is to jump into a pool or go swimming in a river in summer!
a,what a fun b,what fun c,how funny d,how a fun

选a

a
正常语序:It is a fun to jump into a pool or go swimming in a river in summer!
fun可数