请帮解一道高中英语题 谢谢

题目

请帮解一道高中英语题 谢谢
-----it is really cold in winter this year.
-----_________.
A so is it
B no , it isn;t.
C i couldn't agree more
D as is it
答案是C 这个我懂 , 请问帮我说一下ABD怎么用 可以吗? 谢谢
大家看清楚一点哦 D为as is it

答案

so is it是完全倒装,表示进一步的强调,是说事情确实是这样
例如：It is good to practise everyday,so it is
每天锻炼身体是好习惯,确实是这样
no ,it isn;t.不用说了吧?就是一般疑问句的否定回答
as it is = 实际上；副词as it is:
1.in the actual state of affairs and often contrary to expectations
例句与用法:
1.I hope things would get better,but as it is they are getting worse.我希望情况会好转,但实际上是越来越糟.
2.I have to leave it as it is.=我只好随它去了.
3.He isn't nice.As it is,he is bad.= 他不好.事实上,他很坏.
4.This room is as broad as it is long.=那个房间长宽相等.
5.I don't like him.As it is,I hate him.=我不喜欢他.事实上,我恨他.
6.Be that as it may,I'll leave it as it is.=无论如何我们也只能听其自然.
7.As it is,we can hardly get to the station by 6 o'clock.=但事实上,我们几乎不能在六点以前赶到车站.
8.I thought he would get better.As it is,he is getting worse.=我以为他会变好.但事实上,他愈变愈糟.