省略連詞IF的虛擬條件句要倒裝

若虛擬條件句中含有were或had，should等助動詞或情態動詞時，連詞if可以省略,將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

根據主從句的時態搭配，可以判斷是對將來的虛擬，條件從句省略了if，助動詞提前，故答案為C。