Jack swims very fast .Mike swims faster than jack.(理解句意,填空)
Mike is (better)at(swimming )than jack.
Mike (does) (better) in (swimming )than jack.
注:
句中有than 要用比较级,
be good at doing sth = do well in doing 擅长于……
另外,good 与well的比较级都是:better
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