今年上半年，我校九年级举行"时政"竞赛，共有17位同学参加选拔赛，所得分数互不相同,按成绩取前8名进入决赛，若知道某同学分数，要判断他能否进入决赛，还需知道这17位同学分数的                                                               [ ]

A．平均数        

B．中位数          

C．众数          

D．方差

According the judgement in the court, the driver _______pay for all the damage.

A．should

B．must

C．would

D．shall