I didn't see your sister at the party. If she she would have met my brother.A. has comeB

问题补充：

I didn see your sister at the party. If she , she would have met my brother.

A. has come

B. had come

C. did come

D. came

答案：

A. has come

(答案→)B. had come

C. did come

D. came

解析：本题考查的是if条件句中的虚拟语气。句意：我在会议上没看到你姐姐，故你姐姐没来。因此如果“她来了”与事实相反，前面一句交代了虚拟语气的时态是一般过去时的虚拟，所以if从句中用had+过去分词。