made the school proud was more than 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：考察名词性从句。本题第一空中的what引导主语从句what made the school proud，在句中作主语。第二空that引导表语从句，that在句中不充当任何成分，只起引导和连接作用。句意：让这所学校自豪的是超过百分之90的学生都被重点大学录取。要注意what在名词性从句中作主语，宾语或者表语；that在名词性从句中不充当任何成分，只起引导作用，也没有任何的意思。故B正确。