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 part in each of the following questions
Charles W.Eliot, the president of Harvard in 1869, initiated a system under which most required courses were dropped in favor of elective courses
A. initiated
B. compulsory
C. optional
D. necessary
Đáp án C
A. bắt đầu
B. bắt buộc
C. tùy chọn
D. cần thiết