The Taj Mahal which was begun in 1632 and was completed in 1

cost 是过去式,cost cost cost 再问： 呵呵 感觉上这是个客观事实呀 应该用一般现在时的 再答： 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。