省略连词IF的虚拟条件句要倒装
若虚拟条件句中含有were或had，should等助动词或情态动词时，连词if可以省略,将were, had, should提到前面。
【例如】
Had I left a little earlier, I would have caught the train.
Were this to happen, it would cause a great deal of damage. Should it rain tomorrow, we would cancel the trip.____right now, she would get there on Sunday. (CET-4 1996,6)
A) Would she leave
B) If she leaves
C) Were she to leave
D) If she had left
根据主从句的时态搭配，可以判断是对将来的虚拟，条件从句省略了if，助动词提前，故答案为C。