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

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

China's sport stars Yao Ming and Liu Xiang ________ Good will 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