有一题是选择,我拿不准Nancy is good at_______.a.playing the violin b.play the violin

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有一题是选择,我拿不准
Nancy is good at_______.
a.playing the violin b.play the violin

a.playing the violin
be good at doing sth

a

选a.因为at是介词,介词后面的动词用现在分词形式