为什么what great fun it is 这个句子里,great前没有a?

what great fun it is to go hiking in such fine weather!和what a great fun .!哪个对?为什么? What great fun it was!fun前可不可以加a?为什么? What great fun it was! fun前可不可以加a?为什么? what a great fun/what great fun为什么不可以用how great fun 为什么what great fun it is 这个句子里,great前没有a? 英语it is to jump into a river in summer!A how fun B how funny C what great fun D what a great fun为什么 What great fun it will be 和How funny it will be 那个对 为什么 为什么是what great fun it is!而不是what a great fun it is! what great fun it is to go camping in such fine weather,为什么不说what a great fun it is to gocamping in such a fine weather? 英语的fun可数吗?是What a great fun it is!还是What great fun it is! what great fun it is+to do sth 吗 what great fun it is ____ (sit )on the balcony great fun 中fun的词性是什么It's Great fun +doing还是to do?这里的fun 为什么词性? _____ it is to jump into the river to swim in summer.A.What a great fun B.What great funC.How fun D.How funny为什么不用how fun？ 选择：My mom found ___ great fun to learn to drive a car.A.it B.the C.what为什么? what fun day it is?为什么用fun,不用funny fun 可数吗,What.a great fun it is .正确吗 ——it is to jump into a river in summer a how fun b how funny c what a great fun d what great fun