It's ten years since the scientist on his life's work of discovering the valuable chemical.A．made forB．set outC．took offD．turned up 题目和参考答案——青夏教育精英家教网—

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32. 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

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