There years----Three years 为整体,这类表时间,距离,金钱的词不论多少,做主语时,要看成一个整体,谓语动词用单数.
Fifty yuan is not enough.
Thrity kilometers is a long way.
There years----Three years 为整体,这类表时间,距离,金钱的词不论多少,做主语时,要看成一个整体,谓语动词用单数.
Fifty yuan is not enough.
Thrity kilometers is a long way.