They are busy ________ (have) lunch.They are busy to have lunch.为什么看见有写的They are busy having lunch.都是对的么?为什么?
问题描述：
They are busy ________ (have) lunch.
They are busy to have lunch.为什么看见有写的They are busy having lunch.都是对的么?为什么?
答
having
be busy doing sth，用这个词组。没有to do
答
They are busy ________ (have) lunch.
答案：having
解析：be busy doing Sth.= be busy with Sth.忙于做某事
中文：他们忙于吃午饭.