Trái nghĩa của optional

Alternative for optional

Đồng nghĩa: elective, voluntary,

Trái nghĩa: compulsory,

Tính từ

Opposite of outside of, or additional to, the normal educational curriculum or one's duties

Đồng nghĩa của optional

optional Thành ngữ, tục ngữ

English Vocalbulary

Music ♫

Copyright: Proverb ©

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