英语句子改错（每句一处）1.they are busy preparing an evening party.
问题描述：
英语句子改错（每句一处）1.they are busy preparing an evening party.
答
正确的
答
they are busy preparing an evening's party.
答
they are busy with preparing an evening party
或they are busy to preparing an evening party
答
they are busy with preparing an evening party.
be busy with doing sth是个固定搭配
答
they are busy preparing an evening party.
改为they are busy preparing for an evening party.
答
没错啊，短文改错会有一句是对的