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It's ten years since the scientist on his life's work of discovering the valuabl

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It's ten years since the scientist on his life's work of discovering the valuabl

It's ten years since the scientist ________ on his life's work of discovering the valuable chemical.

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A．made forB．set outC．took offD．turned up

试题答案

答案：B

标签：hisonlifeofwork

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