单选题Carol said that the 

问题补充：

单选题CarolsaidthattheworkwouldbewelldonebytheendofOctober,________personallyIwonderedcompletely.A.whichB.at whichC.in whichD.about which

答案：

B解析介词＋which引导的非限定性定语从句。wonder at对…感到疑惑。