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！

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

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

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