问题补充：
China a lot in the ten years.
A. changed, past
B. was changed, first
C. has changed, last
D. has changed, next
答案：
A. changed, past
B. was changed, first
(答案→)C. has changed, last
D. has changed, next
解析：句意：中国在过去的十年里变化很大。in the last ten years，在过去的十年里，这个短语应该跟现在完成时连用。故选C。
