问题补充：
Beijing a lot in the last ten years. It is one of in China.
A. changes, the largest city
B. changed , the larger cities
C. has changed, the largest cities
D. has changed, the largest city
答案：
A. changes, the largest city
B. changed , the larger cities
(答案→)C. has changed, the largest cities
D. has changed, the largest city
解析：句意：在过去十年中北京变化很大。它是中国最大的城市之一。结合语境可知前文描述的是现在已经完成的动作，故用现在完成时态。下文是表示在多个中进行比较，故city用复数形式。选C。
