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.
AWhat ;when
B. that; which
Cwhat; which
D. which; that
答案：
(答案→)A. What ;when
B. that; which
C. what; which
D. which; that
解析：第一空考查表语从句，What在从句中充当was的表语；第二空考查定语从句，先行词20 years ago关系词when在从句中做状语。那所学校发生了巨大变化，它不再是前的样子了，在那时学校设备非常破旧。选A
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