Question

高中英语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
请问定语从句中什么情况下才用as做引导词？（请详细解答）

Answer 1

as 还有“正如，正像”之意，表示说话人的依据、态度、评论和看法，常用在以下结构中：as we all know, as you can see/here/watch/remember/expect. as is often reported, as is known to us all, as has been said before, as often happens等。
as引导的非限制性定语从句课谓语主句前或后，也可在句中。
当先行词前有so/such时，如果关系代词在从句中作主语或宾语，那么只能用as。
例如： It is such a beautiful school as I have never seen before.
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Answer 2

A
as 在这里指代整个主句，引导非限制性定语从句
能指代主句引导非限制性定语从句的还有which. 但如果和 is said/reported/announced/known 等连用带有“正如。。。。一样”的意思时，一般用as, 不用which

Answer 3

很明显，后句说的是前面提到的数字在增加中，我不知道对不对，但是如果是我的话，我会选B

Answer 4

B,非限制性定语从句

Answer 5

A