问一道高二英语虚拟语气选择题目
_________________,Georgewouldcertainlyhaveattendedtheconference.
Aifhedidn'tgetaflattire
Biftheflattirehadn'thappened.
Chadhenothadaflattire
Dhadthetirenotflatteneditself
麻烦告诉一下为什么,
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