what a great fun swimming in the river...和what great fun swimming in the river哪个正确?我查了字典,字典上并没有fun作可数名词的用法啊

what a great fun/what great fun为什么不可以用how great fun What ____!A.a great fun B.funny C.great funny D.great fun 为什么是what great fun it is!而不是what a great fun it is! 英语的fun可数吗?是What a great fun it is!还是What great fun it is! _____it is to help the old men clean the houses!A What a fun B How great fun C How great a fun D What fun _____it is to help the old men clean the houses!A.What a fun B.How great fun C.How great a fun D.What fun what a fun和what fun哪个对 我记得好像有个what a great fun 所以我认为你what a fun what great fun it is to go hiking in such fine weather!和what a great fun .!哪个对?为什么? （ ）it is to meet old friends in a strange place!A.what great fun B.what a great fun C.how great fun D.how a great fun ______ great fun they had!A.What a B.What C.How______ great fun they had!A.What a B.What C.How D.How a ——it is to jump into a river in summer a how fun b how funny c what a great fun d what great fun 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 是how great fun还是what great fun 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? fun 可数吗,What.a great fun it is .正确吗 __it is to play in such good whether!A.What great fun B.How fun (原因, ________it was ________so many elephants marching along the street.A.How great fun; to see B.What a great fun; seeing C.What great fun; to see D.How great a fun; to see.