Mark the letter A, B, C or D on...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is OPPOSITE in meaning to the underlined and bold part in the following question.

A. traced back to the ancient people 

B. a long time ago and unforgettable 

C. new enough for anyone to confirm 

D. still a mystery to everybody