Are you good at ?A. swim B. swimming C. to swim

发布时间：2020-08-22 14:49:42

Are you good at     ?
A. swim      B. swimming      C. to swim

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解析：根据at是介词，可知其后应该用名词或动名词，选项中swim是动词，to swim是动词不定式。所以本题选B。
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