________ the Olympic Games successfully is the most important event of 2009 for us Chinese, ________ proved that China holds a highly significant position in the world．

1. A.
   Hosted;which
2. B.
   To host;as
3. C.
   Hosting;that
4. D.
   Hosting;which

______ the Olympic Games successfully is the most important event of 2009 for us Chinese,_______ proved that China holds a highly significant position in the world．

A．Hosted; which         B．To host; as                 C．Hosting; that          D．Hosting; which