This warning sign indicates that you ____ step on the grass.
Đáp án đúng là: B. mustn't
Giải thích:
'Shouldn't' và 'ought not to' diễn tả lời khuyên không nên làm gì. 'Don't have to' nghĩa là không cần thiết. 'Mustn't' diễn tả sự cấm đoán. Biển báo cấm bước lên cỏ, vậy 'mustn't' là phù hợp nhất.
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