Carol said that the work would be well done by the end of October personally I wondered

问题补充：

Carol said that the work would be well done by the end of October, personally I wondered completely.

A. which

B. at which

C. in which

D. about which

答案：

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。