Beijing a lot in the past ten years. Now it has become one of the biggest modern in the wo

问题补充：

Beijing a lot in the past ten years. Now it has become one of the biggest modern in the world.

A. changes, cities

B. changed, city

C. changed, cities

D. has changed, cities

答案：

A. changes, cities

B. changed, city

C. changed, cities

(答案→)D. has changed, cities

解析：

试题分析: 句意:在过去的十年里北京变化很大。现在北京已经变成为世界上最大的现代城市之一。根据in the past ten years在过去的十年里，可知时态为现在完成时；one of 之一，后接名词复数，故答案选D.