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
网友回答
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。