How many years was spent in building the tower?

问题描述:

How many years was spent in building the tower?
就是不理解为什么陈述句时就这样用,而问句就不这样用了?
Two years was spent in building the tower.
How many years were spent in building the tower?
我是问谓语单复数的用法

Two years 看作一个整体,所以用单数,同类的还有比如100元钱等,都看作单数使用.
问句中,问多少年,强调的是数量,问几个年头,所以用复数.