Many people wrote articles on Liu Xiang had failed to pete in the event .
.
A. why
B. what
C. who
D. that
网友回答
(答案→)A. why
B. what
C. who
D. that
解析：“ Liu Xiang had failed to pete in the event .”做介词on的宾语，宾语从句中不缺主干，故排除B.和C.。另外that不引导介词的宾语从句（固定搭配除外），所以排除D. that