单选题Many people wrote article

问题补充：

单选题Manypeoplewrotearticleson___LiuXianghadfailedtocompeteintheevent.A.whyB.whatC.whoD.that

答案：

A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