单选题The whole Chinese people&

问题补充：

单选题ThewholeChinesepeoplewillneverforgettheday,May12th,,_______thestrongearthquakehappenedinWenchuan.A.on whichB.on thatC.in whichD.from which

答案：

A解析考查定语从句的用法。on which 在此表时间，相当于when。