The Taj Mahal which was begun in 1632 and was completed in 1654 cost a fortune.
问题描述：
The Taj Mahal which was begun in 1632 and was completed in 1654 cost a fortune.
请问为什么用 cost 而不是单三形式的 costs
答
cost 是过去式,cost cost cost呵呵 感觉上这是个客观事实呀 应该用一般现在时的begun in 1632 and was completed in 1654 都是 过去式，应该是为了表示过去建的时候花了多少钱。