It’s ten years since the scientist ________ on his life’s work of discovering the valuable chemical....
2023-02-01 15:24:37 28次 2010届三轮回扣语法专项训练（动词和动词短语） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It’s ten years since the scientist ________ on his life’s work of discovering the valuable chemical.
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A．madefor
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B．tookoff
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C．setout
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D．turnedup
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