Q20:

Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, the army of terra-cotta warriors created to protect Qin Shi Huang, China’s first emperor, in his afterlife is more than 2,000 years old and took 700,000 artisans more than 36 years to complete them.

1. took 700,000 artisans more than 36 years to complete them
2. took 700,000 artisans more than 36 years to complete it
3. took 700,000 artisans more than 36 years to complete

4. 700,000 artisans took more than 36 years to complete
5. to complete them took 700,000 artisans more than 36 years

   Answer:

A  A,D,E错误很明显;

争论集中在B,C;

GWD上的题~应该是take sb some time to do,似乎是个固定用法吧..

首先，并列结构，and后边肯定是动词的过去式，所以排除D、E；

其次，代词指代不明确，在GMAT中代词指代问题要特别注意，在这里前面的名词太多，所以这边代词指代不明确，所以选C，

以上是我只记得想法，仅供参考

thanks !!!!