be busy (in) doing something 与be busy with something的用法

be busy (in) doing something 与be busy with something的用法 busy的用法be busy with后面加什么词be busy in doing与be busy with doing be busy with与be busy in be busy with sth 与be busy doing sth be busy doing 和 be busy in doing 的区别? be busy in 的用法? be busy with doing 和be busy in doing 在用法上有何区别如题 be busy (in) doing sth 和be busy with sth的意思 并做一组句子 be busy in 用法 1.be busy(in )doing 2.be busy to do 3.be busy with 4.be busy be busy with sth 与be busy doing sth的区别 be busy with sth 与be busy doing sth的区别 ,可以互换吗