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：考查从句。第一空考查表语从句连接词what做was的表语；第二空考查定语从句先行词为20 years ago 关系词when在从句中做状语。
