请问这句话中so as的用法

Question

Last term our physical teacher sat so difficult a final examination as none of us worked out.

Answer 1

Last term our physical teacher sat so difficult a final examination as none of us worked out.

【翻译】上学期我们的物理老师设置了一次非常困难的、我们一个人也没有通过的期末考试。

你如果认为这句话中是so···as··用法就错了
这里面用as引导了一个定语从句用来修饰前面的final examination。
而且这句话中as做的是定语从句中 work out 的宾语。

我猜，你一定是困惑为什么不用so···that···句型来表述吧，因为so ···that···句型that后面要接完整的句子，如果后面是none of us worked 【it】 out.那就可以用that了，不然的话work out 缺少宾语，不能构成完整句子。

【拓展】as引导的定语从句
as引导定语句既引导限制性定语句引导非限制性定语重句两种情况都别充主语宾语表语

1）非限制性定语句做主语：
As is known commenly, grammer is over valued in education.
【众所周知教育语重要性强调】
2）非限制性定语句做宾语：
As you know, you get only confusion from endless grammer rules.
【 知道尽语能更困惑】
3）非限制性定语句做表语：
As it actually is, grammer makes no sence to natives.
【实际于英语母语讲语稽谈】
4）限制性定语句做主语：
You learn it as is required in the exam syllabus.
【考试纲原必须习语】
5) 限制性定语句做宾语：
You never understand the diferences as they tell.
【难理解所讲些语差异哪】
6）限制性定语句做表语：
You even feel like the same as never learnt these grammers.
【甚至觉语完全往绪】

Answer 2

这里看到了so as ,其实as就相当于that,so that ,那就是如此以至于，老师给了我们如此难的考试以至于没人能做出来，应当注意后面的work out,并不是work out it ,就因为work out 缺少一个宾语，所以这个as做成分，那么用that 时应该是so difficult a problem that none of us can work it out.注意比较！