問題詳情

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

參考答案

答案：C
難度：適中0.58216
統計：A(11),B(44),C(124),D(15),E(0)

用户評論

【陳琪徨】評論

Not until Kentucky's Mammoth Cave had been completely explored in 1972 _____. not until 子句放句首，主句要倒裝，故選(C) 未變化前基本寫法為The full extent of Kentucky's Mammoth Cave wasn't realized until it had been completely explored in 1972. 或者為It was not until Kentucky's Mammoth Cave had been completely explored in 1972 that its full extent was realized.