一道英语单选,网上有很多答案,现求英语大神给个详解!Give her my best regards,____

题目

一道英语单选,网上有很多答案,现求英语大神给个详解!Give her my best regards,____
a.should you see her today
B.if you saw her today
C.if you would see her today
D.should you have seen her today

答案

Give her my best regards,____
A. should you see her today
B. if you saw her today
C. if you would see her today
D. should you have seen her today
答：A
译：万一今天你见到她的话,请代我向她致以最美好的问候.
析：Should you see her today =If you should see her today, 是虚拟语气.虚拟将来,通过倒装省略if.