be busy+in还是on还是at还是不加
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bebusy+in还是on还是at还是不加bebusy+in还是on还是at还是不加bebusy+in还是on还是at还是不加bebusyindoingsth（正忙于做某事）,一般将in省略了,就写成
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！
be busy+in还是on还是at还是不加
be busy 什么 on还是of还是for还是with
be busy with study还是be busy at study be busy with与be busy at的区别是什么?
是be an expert in/at/on ,还是be expert in/at/on?
英语翻译用on还是in还是at
in 还是on还是 at tomorrow
be clever in 还是 at
BE busy with 还是 BE busy to
be talent at还是be tallent in
be gifted in还是be gifted at还是别的介词?
be gifted in还是be gifted at还是别的介词?
英语翻译用in on 还是at
China前面用in on 还是at
be expert at doing 还是in doing
be talented 后面跟at还是in
court前面用on还是in还是at?field呢?
在上个星期一用介词in还是on还是at
是in Monday,还是on Monday 还是 at Monday