Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.
A. advanced
B. progressive
C. highly-developed
D. all are correct
* Đáp án
D
* Hướng dẫn giải
Đáp án D
Advanced (adj) ~ progressive (adj) ~ highly–developed (adj): tiến bộ; phát triển