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

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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。