Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions:
All of the students are obliged to pass the entrance examination in order to attend the university
A. forced
B. impelled
C. required
D. optional
Đáp án : D
To be obliged to V = bị bắt buộc phải làm gì >< To be optional to V = có thể lựa chọn làm gì