It's ten years since the scientiston his life's work of discovering the valuable chemical.

题目简介

It's ten years since the scientiston his life's work of discovering the valuable chemical.

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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