be good at doing /名词例如 he is good at swimming he is good at math be good at doing 用动词的现在分词，be good at doing sth .
good luck 后接动词有什么形式?关于good luck 有什么短语?关于good luck 有什么相关知识.
be good at doing /名词例如 he is good at swimming he is good at math be good at doing 用动词的现在分词，be good at doing sth .