this school doesn't have-------that one does

选A
解释为：这所学校没有和那所学校一样多的学生（即这所学校的学生比那所学校少）
这句话是否定句,所以用as ...as 和so ...as 都是和...一样的意思,（so...as不能用在肯定句中）
as ...as 和so ...as 中间可以加名词、形容词,加名词的时候,名词全部在as...as 或so ...as 之间.
A as many students as 符合
B many as students as 这里把many students这个名词拆开了,不用拆开
C such few students as such ...as 像...那样的,没有和...一样的意思
D so many as students as 出现了共3个so 和as,且将名词拆开了