China’s sport stars Yao Ming and Liu Xiang _____ Goodwill Ambassadors（親善大使） for Shanghai.

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

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

China’s sport stars Yao Ming and Liu Xiang        Goodwill Ambassadors（親善大使）for Shanghai.

A. has been named   B. have been named   C. has named   D. have named