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 realimtion of its full extent

答案C

解析 not until结构位于句首时，主句部分需要倒装，选项C正确。

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