题目内容
32. It's 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 |
B
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题目内容
32. It's 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 |
B
解析