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

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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

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
as的从句用法
___ is mentioned above,the number of the students of senior high schools is increasing.
A.Which
B.As
C.That
D.It
选B,为什么

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
as比较特殊,在引导定语从句时被归为 关系代词,也就是说它在句中像which一样是充当成分的,但它比which又多了“像、正如”的意思,句中的从句缺少is的主语,并且需要含有“像、正如”的意思,因此选as.此外,也可以说as it is mentioned above,但此时as就不再是关系代词了,句子也不再是定语从句了.