They__a football match tomorrow afternoon. A.play B.will be going to play C.are going to play

C
tomorrow afternoon（明天下午）是一个将来时间 要用一般将来时
一般将来时构成方法：will+动词原形，be going to+动词原形
其中主语是they，谓语动词用are，所以选C

C。are going to play
一般将来时
be going to=will
主语是they，所以用are。

C

c

C