Sam said the work would be done by December personally I doubt very much.A. itB. thatC.

问题补充：

Sam said the work would be done by December, 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：考查从句，首先分析句子，从句personally I doubt very much.缺少宾语，which引导的非限制定语从句

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