work on和be busy doing sth.的区别work on 是从事；忙于什么的意思,be busy doing sth.乜是 忙于某事嘚意思.有什么区别哪?

work on与be busy with be busy with和 work on有什么区别?用法都是什么, work on和be busy doing sth.的区别work on 是从事；忙于什么的意思,be busy doing sth.乜是 忙于某事嘚意思.有什么区别哪? at work和 be busy with sth造句 be busy doing sth可以用work on替换吗?如果不能区别是什么?急用! 存不存在be busy on land on .land at区别?还有：be busy doing 和.be busy to do sth的不同? busy with和 busy on有什麽区别? be busy doing 和 be busy in doing 的区别? be busy with和be busy for的区别 be busy with sth 和 be busy dong he is always busy___ (work)是用be busy doing sth还是 be busy with sth my parents __(be not) busy at work today be busy in 的用法?它和be busy doing, be busy with有什么区别? be busy at do吗 为什么课本上是I am busy at work every day. be busy for的意思和用法 be busy 和哪个介词可以搭配 be busy 什么 on还是of还是for还是with