It’s ten years since the scientist ______on his life’s work of discovering the v

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

选项 A、made for
B、set out
C、took off
D、turned up

答案 B

解析短语动词辨析 make for“走向，促成”；set out“动身，开始，摆放；阐明，陈述”；take off“脱下，起飞，匆匆离开”；turn up “开大，调大；出现，来到”。

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