我在参考书看的是be experienced in+doing sth,be experienced at+sth,但是

be experienced in sth和have experience in sth区别 be experienced at/in的区别 be successful in (doing) sth.be successful at (doing) sth. have experience in doing 的in可以省略,be experienced in 的in可以吗 be interested in doing sth be long in doing sth be busy in doing sth be sophisticated in doing sth 是be interest in doing sth还是be interested in doing sth have experience in 和be experienced in doing 都是在（做）…方面有经验 但具体 造句 be good at doing sth we will be looking at doing sth...