be busy doing中doing什么成分那个句子能说明呢？给个例句

be busy doing造句 be busy doing中,有in么? be+busy+doing=be+( )+( 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 be busy doing中doing什么成分那个句子能说明呢？给个例句 be busy doing sth 与be busily doing的区别 类似be busy doing ,enjoy doing 的初中英语语法 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 英语 翻译 be busy doing sth be busy doing造句10个