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

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

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问题 It’ s ten years since the scientist ______on his life’ s work of discovering the valuable chemical.
选项 A、made for
B、set out
C、took off
D、turned up
答案B
解析
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