My brother is good at填什么(play) basketball.We'll get填什么(strong)

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My brother is good at填什么(play) basketball.
We'll get填什么(strong)

playing
be good at 表示“擅于,在...方面做得好”,at 是介词,后面接名词或者动词的ing形式.We'll get 【stronger】.

playing
be good at 后面要加动词的话要用其ing形式

playing