be busy+in还是on还是at还是不加

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be busy+in还是on还是at还是不加
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be busy+in还是on还是at还是不加
be busy+in还是on还是at还是不加

be busy+in还是on还是at还是不加
be busy in doing sth(正忙于做某事),一般将in省略了,就写成be busy doing sth了
没见过be busy on或者at的,只有be busy with sth,意思和be busy in doing sth一样,如:
1.be busy with sth
例如:I am busy with my homework!
2.be busy in doing sth
例如:I am busy in doing my homework!

be busy in doing

你是问be busy doing sth.吗?
be busy后如果直接加名词的话用with连接

be busy doing sth, 什么都不用加了!