Those were the graduate assistants to do the research work in the lab.
A. to whom it was their responsibility
B. whose responsibility there was
C. whose responsibility was
D. of whom with the responsibility
网友回答
A. to whom it was their responsibility
B. whose responsibility there was
(答案→)C. whose responsibility was
D. of whom with the responsibility
解析：此题考查属格关系代词引导的定语从句，[A]、D.项应先排除；B.项从句的谓语为there be结构，讲不通；因此只有[C]项为正确答案。