Are you good at ________?A.swim B.swims C.swimming D.to swim最好说明理由

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Are you good at ________?A.swim B.swims C.swimming D.to swim最好说明理由
Are you good at ________?
A.swim B.swims C.swimming D.to swim
最好说明理由

Are you good at ________?A.swim B.swims C.swimming D.to swim最好说明理由
c
be good at doing sth.固定句型

C. swimming [你擅长游泳吗?]
be good at …擅长于…,因为at是介词,后面的动词必须加-ing