Not until Kentucky’s Mammoth Cave had been complet...
Câu hỏi: Not until Kentucky’s Mammoth Cave had been completely explored in 1972 _______.
A when was its full extent realized
B was its full extent realized
C that its full extent was realized
D the realization of its full extent
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT Quốc Gia môn Tiếng Anh năm 2015 - Trường THPT Nguyễn Trãi
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