He is good at music and dance，或者 用 介词后面加 动名词这一特点，可升华为 He is good at playing music and dancing 这里主要考的是 be good at 这一短语，时态为一般现在时，表某人经常性习惯性做某事，或某人的兴趣爱好，特长等= =
He is good at music and dance。
He is good at music and dancing.
He is good at music and dance.
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