Many people wrote articles on ___Liu Xiang had failed to compete in the event .

 A. why                   B. what          C. who                  D. that

Many people wrote articles on ___Liu Xiang had failed to compete in the event .

  .A. why            B. what         C. who          D. that

Many people wrote articles on ___Liu Xiang had failed to compete in the event .

  .A. why       B. what         C. who      D. that

Many people wrote articles on ___Liu Xiang had failed to compete in the event . 

1. A.
   why
2. B.
   what
3. C.
   who
4. D.
   that