The number of senior high school students is increasing...The number of senior high school students is increasing,as is mentioned above.请问这个句子后面的部分 as is mentioned above 为什么没有it?

is mentioned above,the number of the students in senior is mentioned above,the number of the students in senior high schools is increasinga that b as c which d it 30分析此句：As is mentioned above,the number of the students in senior high school is increasing. _____ is mentionged above that the number of the students in senior schools is increaaing.A.whichB.asC.thatD.it The number of senior high school students is increasing...The number of senior high school students is increasing,as is mentioned above.请问这个句子后面的部分 as is mentioned above 为什么没有it? as的从句用法___ is mentioned above,the number of the students of senior high schools is increasing.A.WhichB.AsC.ThatD.It选B,为什么 [-B48] _____ is mentioned above ,the number of the students in Senior High school is increasing.A.AsB.ItC.ThatD.What翻译并分析 __is mentioned above,the number of the students in senior high school is increasingA As B It C That D What （ ）is mengtioned above,the number of the students in senior school is increasing.A.which B.as C.that D.it __is mentioned above,the number of students in senior high schools is increasing.A.Which B.As C.That D.Is a number of the number of the number of,a small number of,a number of. the number of造句 the number of造句 the reciprocal of number the number of中文 the number of 是什么意思? the number of同义词 The number of students