(单选题)

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

A.change

B.has changed

C.changing

D.having changed

参考答案：B

参考解析：

The country life是整个句子的主语，定语从句he was used to是用来修饰country life，省略了关系代词that/which。所以整个句子缺谓语动词，CD选项是非谓语动词形式，因此可以排除CD。因为主语country life是单数形式，所以谓语动词要用单数形式，排除A，故答案选B。

知识点：动词时态语态英语语法串讲通用英语

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