Not until Kentucky’s Mammoth Cave had been completely explored in 1972_____.

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问题 Not until Kentucky’s Mammoth Cave had been completely explored in 1972_____.

选项 A、when was its full extent realized
B、that its full extent realized
C、was its full extent realized
D、the realization of its full extent

答案C

解析空格处的意思是：直到肯塔基州的猛犸洞在1972年完全勘探完毕，它的范围才全面被了解。本题not until结构位于句首时，主句部分需要倒装，应选择C。

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考博英语

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Not until Kentucky’s Mammoth Cave had been completely explored in 1972_____.

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