I'm good at basketball.A.play B.plays C.playing D.to play

问题描述:

I'm good at basketball.A.play B.plays C.playing D.to play
I'm good at basketball.
A.play B.plays C.playing D.to play
I'm good at basketball.
A.play B.plays C.playing D.to play
呵呵、、、、请给出为什么选这个答案的理由、、、、

选C,因为at是介词,介词后只能接动词的ing或者名词