Many people wrote articles on Liu Xiang had failed to compete in the event . .A. why B. wh

问题补充：

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

.

A. why

B. what

C. who

D. that

答案：

(答案→)A. why

B. what

C. who

D. that

解析：“Liu Xiang had failed to compete 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