All of the students are obliged to pass the entrance examination in order to attend the university

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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

forced

impelled

required

optional

Giải thích

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