问题
选择题
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
答案：D
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。