问题标题：
【It'shardformetoimaginewhatIwouldbedoingtodayifIinlove,attheageofseven,withtheMelindaCoxlibraryinmyhometown.A.wouldn'thavefallenB.hadnotfallenC.shouldfallD.weretofall答案选B,但A不是也行的么?又虚拟又】
问题描述：
It'shardformetoimaginewhatIwouldbedoingtodayifIinlove,attheageofseven,withtheMelindaCoxlibraryinmyhometown.
A.wouldn'thavefallen
B.hadnotfallen
C.shouldfall
D.weretofall答案选B,但A不是也行的么?又虚拟又与过去事实相反怎么选啊?
孙俊台回答：
当与过去情况相反时从句用haddone,主句用would/couldhavedone
你的问题的题干很明显if后面是“从句”,所以选B
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