what a great fun/what great fun为什么不可以用how great fun

what a great fun/what great fun为什么不可以用how great fun 是how great fun还是what great fun what great fun\what a great fun.哪个对 为什么是what great fun it is!而不是what a great fun it is! great fun 和a great fun What great fun和What a great fun哪个才是正确的? what a great fun swimming in the river...和what great fun swi What a great fun it is to go surfing; What great fun it is t 请问那个正确 What a great fun it is to go surfing; What great fun what a great fun it is to go fishing和what great fun it is to 用what what a()n how填空 1.( )great fun they had last night great fun