一题英语里面的『被动语态』的问题,请英语高手详细回答,而且说出为什么填这个答案！谢谢高手们！

Question

The taj Mahal___(build)in the seventeenth century for the emperor Shah Jehan.A few years after he____(become)ruler.his wife,Mumtaz-i-mahal,____(die).The Taj Mahal______(build)in her honour.Experts____(call)in from many parts of the world to construc the domes and to decorate the walls.The Taj Mahal which____(begin)in 1632 and_____(complete)in 1654______(cost)a fortune.Up to the present day,it_____(visit) by millions of people

Answer 1

was built,看for the emperor Shah Jehan说明是以前建造的,用过去被动;
had become,是过去已经当上,用过去完成被动;
dead 点动词,不能用had been dead
was built 和第一空用法一样
were called"Experts"是复数,在过去被叫做,所以用were called
was begun
(was) completed 都是过去被动语态
cost 要前后时态一致 cost的过去式和原形一样
Up to the present day是指现在,所以用现在时被动语态is visited 已经被上百万得人参观了

不知这个答案是否可以呢

Answer 2

was built
became (had become)
died
was built
were called
was begun
(was) completed
had cost
is visited

Answer 3

was built,看for the emperor Shah Jehan说明是以前建造的,用过去被动;
had become,是过去已经当上,用过去完成被动;
dead 点动词,不能用had been dead
was built 和第一空用法一样
were called"Experts"是复数,在过去被叫做,所以用were called
was begun
(was) completed 都是过去被动语态
cost 要前后时态一致 cost的过去式和原形一样
Up to the present day是指现在,所以用现在时被动语态is visited 已经被上百万得人参观了