The number of senior high school students is increasing...

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?

qiyaodong 1年前已收到1个回答举报

波尔朵丝幼苗

共回答了15个问题采纳率：86.7% 举报

这里是as单独引导定语从句,先行词可以是一个词,也可以是一个句子或短语.例如：
(1) She is late, as is often the case.她迟到了,这是经常的事.(先行词是整个主句)
(2) To shut your eyes to facts, as many of you do, is foolish.对事实视而不见--你们好多人都是如此的愚蠢.(先行词是不定式短语)

1年前

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