题目内容：

专家请进!_____it will be when we go to the park!A,how fun B,what fun
请说明理由!
呵呵，注意！fun既是名词又是形容词！

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what fun (it is )to do 干某事多有趣呀 eg1：Jingle bells,jingle bells,what fun it is to wish our friends a very merry Christmas!铃儿响,祝福到,愿我们所有的朋友圣诞快乐!eg2：_______fun it is to travel ar...