【Thefolksweredelightedatthemessageoftheirrelatives_____thatmineexplosion.A.survivedB.tosurviveC.weresurvivingD.havingsurvived为什么选D?为什么不选B?TheChinaPavilion,_____,"TheCrownoftheEast,"hasauniqueroof,isone】

　　Thefolksweredelightedatthemessageoftheirrelatives_____thatmineexplosion.

　　A.survivedB.tosurviveC.weresurvivingD.havingsurvived

　　为什么选D?

　　为什么不选B?

　　TheChinaPavilion,_____,"TheCrownoftheEast,"hasauniqueroof,isoneofthemostimportantstylefeaturesintraditionalChinesearchitecture.

　　A.whosestructureB.whichstructureC.structureofwhichD.ofwhichstructure

　　为什么不选C?