be busy in 用法

be busy in 用法 be busy in 的用法?它和be busy doing, be busy with有什么区别? busy的用法be busy with后面加什么词be busy in doing与be busy with doing与be busy doing有什么区别 be busy with doing 和be busy in doing 在用法上有何区别如题 be busy (in) doing something 与be busy with something的用法重点是它们各自的用法和各自强调的是什么? be busy in doing sth be busy for的意思和用法 be busy with与be busy in二者的意思都是忙于（做）什么事情,那么它们在具体用法及意思上有什么区别? be busy doing 和 be busy in doing 的区别? be busy in Ving,这样的用法是固定搭配吗?在busy后加上介词in,是英语中的固定搭配吗? 1.be busy(in )doing 2.be busy to do 3.be busy with 4.be busy for区别? busy用法 be active in 用法 be busy doing sth和be busy with sth这两个句式的意思和用法 be busy doing sth和be busy with sth这两个句式的意思和用法, be busy doing sth和be busy with sth用法详细讲解 BE BUSY IN DOING 的例句 be busy doing中,有in么?