問題詳情

40. It wasn’t until the fall of the empire in 1991 ______ entering the area became possible for historians.
(A) before
(B)after
(C) upon
(D) that

參考答案

答案:D
難度:困難0.330097
統計:A(29),B(18),C(14),D(34),E(0)

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