They are busy ________ (have) lunch.
Theyarebusytohavelunch.是对的吗？为什么看见有写的Theyarebusyhavinglunch.都是对的么？为什么？...
They are busy to have lunch.是对的吗？为什么看见有写的They are busy having lunch.都是对的么？为什么？
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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。
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。
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