问题标题：
-Ithoughtyouwouldjoininmybirthdaypartytomorrow．-IwouldifI____toattendanimportantmeeting．（）A.don'thaveB.didn'thaveC.willnothaveD.wouldnothave
问题描述：
-I thought you would join in my birthday party tomorrow．
-I would if I ____ to attend an important meeting．（）
A.don't have
B.didn't have
C.will not have
D.would not have
付迎利回答：
答案：B．
根据句意以及句中所使用的时态可知，本句是虚拟条件句；由于答语中的if从句表达的是与将来事实相反的假设"如果我不是非得参加一个重要的会议"；故此处应使用一般过去时，故选B．
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