be busy 什么 on还是of还是for还是with

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be busy 什么 on还是of还是for还是with
be busy 什么 on还是of还是for还是with

be busy 什么 on还是of还是for还是with
be busy doing sth.
be busy with...

固定搭配
be busy doing sth
be busy with sth

be busy with
忙于
She's busy with some important work.
她正忙于一些重要工作。
另有
be busy in
忙于
He is busy in preparing for the examination.
他忙着准备考试。
be busy doing sth忙于做某事
希望可以帮到你,谢谢~!!

不要这么懒啊~找本字典一翻就找到了的
be busy at/with sth.
be busy doing sth.
都是忙于某事的意思