问题标题：
I____toyourbirthdaypartylastSunday.Unfortunately,youwereoutonbusiness—I____toyourbirthdaypartylastSunday.—Unfortunately,youwereoutonbusiness.A.hadcomex05x05B.camex05x05C.wouldcomex05D.wouldhavecomeyouwereoutonbu
问题描述：
I____toyourbirthdaypartylastSunday.Unfortunately,youwereoutonbusiness
—I____toyourbirthdaypartylastSunday.
—Unfortunately,youwereoutonbusiness.
A.hadcomex05x05B.camex05x05C.wouldcomex05D.wouldhavecome
youwereoutonbus?怎么成were?还有这段对话有点怪,Unfortunately,youwereoutonbus不幸的是,你出去经商了.这句话应该是I说的把?
wouldhavedone为什么是对过去的虚拟？
白坤回答：
这是个对话.-我本来上周日要去你的生日聚会的,-不幸的是,你出差了.
上周的事,但是没有来.所以是对过去的虚拟.过去的虚拟就用wouldhavedone
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