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It's ten years since the scientist _______on his life's work of discovering the valuable chemical.
A.made forB.set outC.took offD.turned up
B
此题考短语动词。句子合理的意思应是:自从那位科学家着手/开始去为发现这一有价值的化学物质而工作。至今已经10年。选B项表开始或着手某事,即set out to do sth.或set out on sth.正合理。make for不是固定短语,只能解释为“为……而做”,take off当“脱下(衣物)、从……取下……、(飞机)起飞”等解,turn up意为“出席、露面”,这三项均不合题意。
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