___great fun they have ___on the playground !

___great fun they have ___on the playground !
A.What a;to play B.What;playing
C.How a;to play D.How ;playing
详细讲解!!!!!!!!!!!!!!!!!
B
fun是不可数,不用加冠词a,正孝蠢在玩,用动词进行式

学习巧弯陪闹搜是一件愉快的事! (*^__^*)
请及时采纳,多谢!
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