Peter told us the work would be finished by next month, personally I doubt very much.
A. which
B. when
C. that
D. it
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(答案→)A. which
B. when
C. that
D. it
解析：考察非限制性定语从句。本题中关系代词which指代前面一句话中的the work would be finished by next month,这件事情，并在句中做为动词doubt的宾语。When是关系副词，在句中不能做宾语，it不能引导定语从句。That不能引导非限制性定语从句。故A正确。