问题
选择题
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
答案：B
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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：B
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