It is ten years since the scientist ______ on his life’s work of discovering the valuable chemical. ...
2022-12-22 21:40:13 130次 2014届吉林省高二上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It is 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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