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问题: 帮忙选择

This is a young man from our group,___ to help
you with your experiments.
A. whose job it is B. it is whose job
C. whose job is it D. whose is the job

解答:

选A
B 双谓语
C,D说不通

it is是定语从句转换为it is this young man's job to help you.