The country life he was used to greatly since the opening policy.
A. changed
B. has changed
C. changing
D. having changed
网友回答
A. changed
(答案→)B. has changed
C. changing
D. having changed
解析：此题考查考生对句子结构的分析理解能力。此题中he was used to为定语从句，对the country life进行修饰，所要选的内容应为句子的谓语动词，故排除C、D，而since通常用于现在完成时态。故选答案为B。