一道高一英语题语法~What is often the case is that we have worked out

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一道高一英语题语法~
What is often the case is that we have worked out the production plan.
这句话属于什么从句?
给讲一下,谢谢

What is often the case is that we have worked out the production plan.
这句话属于什么从句?
给讲一下,
答：这句话属于主从复合句.它有三套主谓结构.一个主句,二个从句.
1.主句是主系表结构.A is B
2.主语是一个从句 A= What is often the case
3.表语也是一个从句 B= that we have worked out the production plan
译：留给楼主,或改编此题句的人.
评：这个句子是由一道选择题改编曲而来的.或者说是由另外一个句子改编过来.改编者只注重形式,没注意句意.改坏了.
原题是：
_____ is often the case,we have worked out the production plan.
A.Which B.When C.What D.As
答案是D
原句是：As is often the case,we have worked out the production plan.
译文：像往常一样,我们已经制定出了生产计划.
大家注意这四个句型的结构,它们的意思是差不多的：
1.That the earth goes aroung the sun is known to us all.
2.It is known to us all that the earth goes around the sun
3.As is known to us all,the earth goes around the sun.
4.What is known to us all is that the earth goes around the sun.
1.是主语从句在最前面.
2.是用形式主语it,将真主后置.
3.是由as引导非限制性定语从句,放句首.有“正如.那样”的意思.与上面的题句是一类.
4.是和楼主的句子一类的.
可楼主的这个题句是不完整的,或者说是没有意义的一个句子.尽管结构正确.

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