15. The country life he was used to _____ greatly since the opening policy.
A. change B. has changed
C. changing D. having changed
15. The country life he was used to _____ greatly since the opening policy.
A. change B. has changed
C. changing D. having changed
B
选B。The country life 是定语从句的先行词,同时也是句子的主语。而he was used to是定语从句,省略了关系代词that/which。