chemical A. machine B. Chicago C. character D. cheerful 题目和参考答案——青夏教育精英家教网—

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chemical A. machine B. Chicago C. character D. cheerful

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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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It is ten years since the scientist ______ on his life’s work of discovering the valuable chemical.

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

A．madefor

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