变成陈述句是
the school your father attended is the one (that). youreally wants to go to

就可以看出缺先行词the one,做宾语的that 省略了为什么不能是the school 做先行词呢主语是the schoolyour father attended 仍然是定语从句修饰school is后面引导的表语从句，在这个表语从句里，the one 做主语