-----Did Oliver's parents leave him any money?　　　　

-----No, he had to support _____.

A．on his own

B．all alone

C．by himself

D．himself

如果众数组前后两组的频数相同，则（）。

A.众数等于众数组下限

B.众数等于众数组上限

C.众数等于众数组组中值

D.众数等于中位数