Bài tập Từ Đồng nghĩa - Trái nghĩa có đáp án Phần 4
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A vertical post with a warning message was erected in the swimming pool to warn people of its depth

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A vertical post with a warning message was erected in the swimming pool to warn people of its depth.

optional

horizontal

physical

essential

Giải thích

Đáp án đúng là: B