be good at doing sth.be good at=do well in 是不是 do well in doing sth?

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begoodatdoingsth.begoodat=dowellin是不是dowellindoingsth?begoodatdoingsth.begoodat=dowellin是不是dowellind

be good at doing sth.be good at=do well in 是不是 do well in doing sth?
be good at doing sth.be good at=do well in 是不是 do well in doing sth?

be good at doing sth.be good at=do well in 是不是 do well in doing sth?
是的 因为 at 和 in 都是介词 后面都要加名词或动名词