D
这道题考点是主谓一致
当表示时间、距离、长度、价值、金额、重量等复数名词做主语时,常被看做整体谓语动词用单数.
送你两个例句吧!帮助你更好地理解!
eg:Twenty years is a long time.
A hundred miles is a quite a long drive.