Great changes have taken place in that school it is no longer it was 20 years ago it w

问题补充：

Great changes have taken place in that school, it is no longer it 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：主要测试表语从句。句子意思：那所学校发生了巨大的变化，它已经不再是二十年前配备非常差的样子了。分析句子结构可知句子 it was 20 years ago中缺少表语，而且还要引导该句子作前面句子 it is no longer的表语。又是一双重作用：what。第二空属于定语从句，前面有时间20 years ago，可以断定用when来引导。故此答案显而易见。