Great changes have taken place in that school. It is no longerit was 20 years ago it was

问题补充：

Great changes have taken place in that school. It is no longerit was 20 years ago, it was so poorly equipped.

A. what; when

B. that; which

C. what; which

D. which; that

答案：

(答案→)A. what; when

B. that; which

C. what; which

D. which; that

解析：考查名词性从句和非限制性定语从句。句意：在那个学校发生了巨大的变化，不再是的样子了，那时配备的很差。第一个是表语从句：表语从句缺表语，要用what连接，后面有逗号，肯定是非限制定语从句，后面句子不缺主语宾语这种成分，那么就是选择一个关系副词，先行词20 years ago,选A。