Ten dollarsa big sum for a small child and they will go a long way.A. areB. beingC. haveD.

问题补充：

Ten dollarsa big sum for a small child,and they will go a long way.

A. are

B. being

C. have

D. is

答案：

A. are

B. being

C. have

(答案→)D. is

解析：考查主谓一致。英语中表示金钱，时间，距离的名词作主语，其谓语动词用单数。句意：对小孩来说，10美元是一个大的数目，他们将保存很长时间。