Bynineo’clock,alltheOlympictorchbearershadreachedthetopofMountQomolan

By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, _______appeared a rare rainbow soonA.of whichB.on whichC.from whichD.above which

D解析考查非限制性定语从句的介词+which的用法，原句可还原成…a rare rainbow appeared above …。根据选项我们已经知道了考查的大方向，就是需要我们找到合适的介词搭配。。一道罕见的彩虹出现在Mount Qomolangma的上方。appeared a rare rainbow为倒装形式。

谢谢了