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

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Not until Kentucky’s Mammoth Cave had been completely explored in 1972_________

A. when was its full extent realized

B. the realization of its full extent

C. was its full extent realized

D. that its full extent was realized

* Đáp án

C

* Hướng dẫn giải

Đáp án C

– cấu trúc Not until + N/mệnh đề, mệnh đề đảo: không cho đến tận khi.

Copyright © 2021 HOCTAP247