Carol said that the work would be well done by the end of October, personally I wondered pletely.
A. which
B. at which
C. in which
D. about which
网友回答
A. which
(答案→)B. at which
C. in which
D. about which
解析：句意，Carol说十月末，这项工作将会被很好地完成，就我个人而言，我很疑惑。介词＋which引导的非限定性定语从句。wonder at对…感到疑惑。