说明：   医院有A、B、C、D、E、F、G七位大夫，在一星期内(星期一至星期天)每人要轮流值班一天。现在已知： A大夫比C大夫晚一天值班； D大夫比E大夫晚二天值班； B大夫比G大夫早三天值班； F大夫的值班日在B和C大夫的中间，且是星期四； 请确定每天究竟是哪位大夫值班
(Hospital A, B, C, D, E, F, G 7 doctor within a week (Monday-Sunday) to shifts each day. Now known : A doctor later than C day the doctor on duty; D E doctor than two days later the doctor on duty; Doctor G B than the doctor on duty three days earlier; F doctor on duty at the B and C doctor in the middle, which is Thursday; Please identify any day is the doctor on duty)