◎ 题干
It's ten years since the scientist        on his life's work of discovering the valuable chemical. 
[     ]
A. made for          
B. set out    
C. took off        
D. turned up
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“It's ten years since the scientiston his life's work of discovering the valuable chemical. [ ]A. made forB. set outC. took off D. turned up…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。