题目

—Did you go to bed ______last night，Li Ping? —No，I went to bed ______instead. A．later；early            B．late；early        C．lately；early          D．lately；earlily 答案：B果果家7月份每天订3盒酸奶，按优惠价共付316.2元，每瓶牛奶4.15元，这样每盒比零售价便宜多少元？