楼主 我给您改下句子就行了The school graduated the same proportion of blacks as it graduated whites
这里it 代指 school as 是正如 和..一样的意思 did代指 gratuated 再给您个例子 He laughed in a way as he usually did .整句话的意思是 从这所学校里 有同样比例的黑人和白人学生 毕业