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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．

[]A．

made for

B．

set out

C．

took off

D．

turned up

试题答案

答案：B

标签：hisonlifeofwork

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