( )is mengtioned above,the number of the students in senior school is increasing.A.which B.as C.that D.it

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( )is mengtioned above,the number of the students in senior school is increasing.
A.which B.as C.that D.it

选B,which 引导非限制性定语从句时可以指代整个句子,如:The number of the students in senior high schools is increasing,which is mentioned above.
而 as 也有这一用法,且与 which 不同的是,which 从句只能位于主句之后,as 从句可在主句之前或之后,甚至插在主句中.

B