be busy doing 是不是省略了in 应该是 be busy in doing 还有 上面两个跟be busy with 有什么区别么

be busy doing 是不是省略了in 应该是 be busy in doing 还有 上面两个跟be busy with 有什么区别么 be busy doing造句 be+busy+doing=be+( )+( will be doing和will doing的区别就这个 是不是be可以省略啊? 有没有be busy in doing sth.（忘了-_- be busy doing 和 be busy in doing 的区别? be busy with doing 与be busy doing 区别 be busy doing等于什么 be busy doing sth 例句 be busy in doing sth be busy doing 过去式+造句 jean is busy cooking in the kitchen是不是错句?不是be busy doing sth?为什么没有sth?be busy doing是谓语动词? be busy with sth 与be busy doing sth be busy doing还是be busy to dokuai 为什么是be busy doing而不是be busy to do be busy to do 还是 be busy doing be busy doing sth 与be busily doing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与be busy doing有什么区别