Question

George is the only person who ________ introduced to the general manager．

1. A.
   has been
2. B.
   have been
3. C.
   having
4. D.
   had

Answer 1

A
the only one of+复数名词+who／which／that引导的定语从句，谓语动词用单数，这句句子的意思是“乔治是唯一一位被介绍给总经理的人。”从意思和时态上看，谓语动词应为现在完成时的被动结构。