Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Many natural resources_________by 1he end of the century.
A. had disappeared
B. have disappeared
C. disappeared
D. will have disappeared
Đáp án là D. Với cụm thời gian by + mốc thời gian ( tương lai ) thường câu sẽ chia ở tương lai hoàn thành