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The number of the students in senior high school,( )is menti

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The number of the students in senior high school,( )is mentioned above,is increasing
The number of the students in senior high school,( )is mentioned above,is increasing.
A.as B.which C.what D.that
请解释下定语从句中什么时候用as做引导词。
A.as
as引导非限制性定语从句时,位置:可在主句之前,之后,之中.
as意思是“就像.、 如同.”,从句中的动词通常是know,see .,mention 等等表示某人的意见,看法等等
而which引导的非限制性定语从句只能放在主句之后.which指代某个事实
The number of the students in senior high school,( as )is mentioned above,is increasing
= ( as )is mentioned above ,the number of the students in senior high school is increasing
=The number of the students in senior high school is increasing,( as )is mentioned above