问题
选择题
It’s ten years since the scientist ________ on his life’s work of discovering the valuable chemical.
A．madefor
B．tookoff
C．setout
D．turnedup
答案
答案：C
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It’s ten years since the scientist ________ on his life’s work of discovering the valuable chemical.
A．madefor
B．tookoff
C．setout
D．turnedup
答案：C