Question

China's sports stars Yao Ming and Liu Xiang ________ Goodwill Ambassadors（亲善大使）for Shanghai.

1. A.
   has been named
2. B.
   have been named
3. C.
   has name
4. D.
   have named

Answer 1

B
现在完成时的被动语态的构成为“助动词have/has+been+及物动词的过去分词”。又由题意“中国的体育明星姚明和刘翔已被任命为上海的亲善大使”可知选B。