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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 make for意为“走向，驶向；有助于，有利于”，take off意为“脱下；起飞；成功；取消”，turn up意为“出现，露面”，而set out意为“开始，着手”，所以选B。
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