III. Đồng nghĩa - Trái nghĩa có đáp án
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School uniform is no longer compulsory in many British schools, so students can wear clothes that they like. A. mandatory B. required C. imperative D. optional

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School uniform is no longer compulsory in many British schools, so students can wear clothes that they like.

mandatory

required

imperative

optional

Giải thích

Chọn D