what a fun it is to swim in summer.为什么要去掉a呢?不是how fun啊

what a fun和how fun的用法是what a fun it is to do sth还是how fun ? ()it is to fly kites in the parka what fun b how fun c how funny d what a fun what fun it is to=how____ 为什么是what fun it is to. _____ to have a good rest after a long journey.A.What a fun it is B.what the fun it is C.What fun it is D.How fun it is ________ it is to have a cold drink on such a hot day!A.What a fun B.How fun C.What fun D.How a fun （）it is to have a swim in hot summerA:what a fun B:what fun C:how fun D:how a fun ______ it is to visit China some day in the future.A What a fun B How fun C What fun D How a fun What a ____(fun)story it is! ( )it is to visit china some day in the future what a fun 2how fun 3what fun 4how a fun ----------it is to listen to music A How fun B How a fun C Whae a fun D What fun 选什么 ____great fun it is to talk with you!A.What B.what a 选什么,理由, ____great fun it is to have a picnic.是what a 还是what?理由 这题咋选?( ) it is to skate on real rice!(a.what fun b.what a fun c.how a fun d.what funs) 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 visit the science museum!A.What fun B.How funny C.What greatly fun D.What a fun （ ）it is to go winter-water rafting!A、What a fun B、What fun C、How fun D、What funny ---- it is to go for a picnic on such a fine day!A,What a fun B,What fun C,How funny D,How a fun请详解