问题描述：
It's hard for him to imagine what I would be doing today if I___in love,at the age of seven,with the Melinda Cox library in my home town.
A. wouldn't have fallen
B. had not fallen
C. should fall
D. were to fall
为什么选B?请解释.
问题解答：
at the age of seven
过去虚拟
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