题目选项分析

Alongside Petra and the Great Wall of China as one of the seven wonders of the modern world,

the Taj Mahal, which was constructed to memorialize Mumtaz Mahal, the third wife of emperor Shah Jahan, after her passing, took more than 12 years of thousands of engineers' labor to build

Alongside Petra and the Great Wall of China as one of the seven wonders of the modern world,

more than 12 years were needed to build the Taj Mahal, which thousands of engineers labored at to memorialize Mumtaz Mahal, the third wife of emperor Shah Jahan, after her passing