Our country great changes in the last 30 years and it is no longer it used to be.A. went

问题补充：

Our country great changes in the last 30 years and it is no longer it used to be.

A. went through; what

B. went through; that

C. has experienced; that

D. has experienced; what

答案：

A. went through; what

B. went through; that

C. has experienced; that

(答案→)D. has experienced; what

解析：考查时态和表语从句。根据in the last 30 years可知第一句应该使用现在完成时。What it used to be是表语从句，what引导起这个表语从句并在句中做表语。句意：在过去的30年里我们国家经历了巨大的变化。已经不再是30年前的那个国家了。