It's ten years since the scientist _ on his life's work of discovering the valuable chemic

题目简介

It's ten years since the scientist _ on his life's work of discovering the valuable chemic

题目详情

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
题型:单选题难度:中档来源:同步题

答案

B

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