Mary lost the ticket. She didn’t go to the concert.20/22 Mary lost the ticket. She didn’t go to the concert.If Mary had lost the ticket, she would have gone to the concert.Had Mary not lost the ticket, she would have gone to the concert.Hadn’t Mary lost the ticket, she would have gone to the concert.If Mary hadn’t lost the ticket, she would go to the concert.Giải thíchĐáp án đúng là: B Dịch: Mary đã mất vé. Cô ấy không thể đến buổi hòa nhạc.