Great changes have taken place in that school. It’s no longer it was 20 years ago it wa

问题补充：

Great changes have taken place in that school. It’s no longer it was 20 years ago, it was so poor.

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。句意：那所学校发生了巨大的变化。它不再是前的那所学校了，那时它很穷。第一空的表语从句中缺少表语，如：China is not what it used to be 30 years ago中国不再是30年前的中国了；第二空的先行词是20 years ago，后跟的是定语从句，从句中缺少时间状语，故填when。故选A。