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

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(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20年的样子了，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。