made the school proud was more that 90% of the students had been admitted to key univers

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A. What…because
(答案→)B. What…that
C. That…what
D. That…because
解析：主要测试主语从句和表语从句。分析句子结构可知：句子     made the school proud 缺少主语，另外还要引导主语从句，故此只能选择what，由此先排除C、D两答案。再结合句子     more that 90% of the students had been admitted to key universities结构完整不缺少成分，只需要引导词。句子意思：让我们学校自豪的是百分之九十多的学生被重点大学录取。