be busy with 和 be busy doing sth 意思和用法有什么区别?知道的帮忙讲下,

be busy with 和 be busy doing sth 意思和用法有什么区别?知道的帮忙讲下, up to sth 的用法和be busy doing有什么区别吗 be busy (in) doing sth 和be busy with sth的意思 并做一组句子 词组be busy with sth和be busy in doing有何区别 be busy doing sth和be busy with sth be busy doing sth和be busy with sth用法详细讲解 be busy with doing 和be busy in doing 在用法上有何区别如题 be busy doing sth 和be busy to do sth 的区别 be busy doing 和 be busy in doing 的区别? work on和be busy doing sth.的区别 busy的用法be busy with后面加什么词be busy in doing与be busy with doing be busy to do sth.和be busy doing的区别