Trang chủ/Câu hỏi/Why is Option 4 more expensive than the others?Quay lạiClick meXem chi tiết bài testChia sẻWhy is Option 4 more expensive than the others?Chọn một đáp ánWhy is Option 4 more expensive than the others?AA. It has state of the art surveillance.BB. It has video cameras.CD. It offers a back-up system.DC. It includes a one year data archive.Câu hỏi liên quanWhat does the woman ask the man to do?Where most likely does the woman work?What problem does the woman mention?Where most likely does the man work?