The country life he was used to greatly since the opening policy.A. changeB. has changedC

问题补充：

The country life he was used to greatly since the opening policy.

A. change

B. has changed

C. changing

D. having changed

答案：

A. change

(答案→)B. has changed

C. changing

D. having changed

解析：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。