It's ten years since the scientist ___on his life's work of discovering the valuable chemi

题目简介

It's ten years since the scientist ___on his life's work of discovering the valuable chemi

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:黑龙江省期中题

答案

B

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