What evidence does the Japanese team ________ that they really reached the summit of Mt．Qomolangma?

1. A.
   have been proved
2. B.
   have being proved
3. C.
   have to prove
4. D.
   have proved

What evidence does the Japanese team_______that they really reached the summit of Mt．Qomolangma?  

A．have been proved               B．have being proved

C．have to prove                   D．have proved