China became the 143^rd member of the WTO on December 11,2001, thus ________ its 15 year wish to join the global trade body．

1. A.
   realized
2. B.
   to realize
3. C.
   having realized
4. D.
   realizing

 China became the 143rd member of the WTO on December 11, 2001, thus _______ its 15-year wish to join the global trade body.

     A. realized           B. to realize         C. realizing            D. having realized

China became the 143rd member of WTO on December 11,2001, thus 　　　 its 15-year wish to join the global trade body.

A. realized　　　　 B. to realize　　　 C. having realized　　　 D. realizing