Mark the letter A, B, C or D to indicate the sentence that is closest in meaning to each of the following questions. Các bạn giải hộ mình với mình cần gấp ----- Nội dung dịch tự động từ ảnh ----- 4. It's against the rules to use your mobile phone in class. A. You must use your mobile phone in class. B. You can't use your mobile phone in class. C. You mustn't use your mobile phone in class. D. You should use your mobile phone in class.