It's _________ (great fun) going on a picnic with friends.

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It's _________ (great fun) going on a picnic with friends.
It's _________ (great fun) going on a picnic with friends.

It's _________ (great fun) going on a picnic with friends.
It's __ great fun_______ (great fun) going on a picnic with friends.
fun是不可数名词,所以不能加a

great fun 填原型