Carol said the work would be done by Octorber personally I doubt very much.A. it B. that

问题补充：

Carol said the work would be done by Octorber, personally I doubt very much.

A. it

B. that

C. when

D. which

答案：

A. it

B. that

C. when

(答案→)D. 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。which引导的非限定性定语从句。爱定语从句中which做宾语，that不能引导非限制性定语从句，选D。