Question

I didn't see your sister at the party. If she ______, she would have met my brother.

1. A.
   has come
2. B.
   had come
3. C.
   did come
4. D.
   came

Answer 1

B
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。