题目

“应如何定立交界，由两国派出信任大员秉公查勘。……在塔尔巴哈台会齐商办，……将所指各交界作记绘图……仍会同具文，画押用印，当为补续此约之条。”根据此条款约定，中俄签订了（    ）A．《瑷珲条约》                        B．《北京条约》C．《勘分西北界约记》                  D．《伊犁条约》—Must I wash the clothes before supper? —No, you ________ .You can do it after supper. A. need B. needn't C. could D. couldn't