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 valuable chemical．
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A．made forB set outC．took offD．turned up试题答案
答案：B
解析：set out 动手。句意为：从这位科学家开始发现有价值的化学药品的工作已经＋年了。 |