They are busy-------(have)an evening party. have用什么形式.
问题描述：
They are busy-------(have)an evening party. have用什么形式.
答
They are busy having an evening party.
be busy doing sth.=be busy with sth. 忙着做某事
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答
having
busy doing sth为固定用法
答
having
注；be busy doing sth 固定用法‘ 忙于做某事’
答
They are busy having an evening party.
be busy doing sth.=be busy with sth. 忙着做某事