问题
选择题
The country life he was used to______greatly since the opening policy.
A．changed
B．has changed
C．changing
D．having changed
答案
答案：B
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。