as is known to everybody ,it may now be too late to clean up the river.—— is known to everybody ,it may now be too late to clean up the river.A as B what C that 选A 请问不能选what引导主语从句吗?that怎么不对呢,也可以做主语

as is known to everybody ,it may now be too late to clean up the river.—— is known to everybody ,it may now be too late to clean up the river.A as B what C that 选A 请问不能选what引导主语从句吗?that怎么不对呢,也可以做主语
as is known to everybody ,it may now be too late to clean up the river.
—— is known to everybody ,it may now be too late to clean up the river.
A as B what C that
选A 请问不能选what引导主语从句吗?that怎么不对呢,也可以做主语啊

as is known to everybody ,it may now be too late to clean up the river.—— is known to everybody ,it may now be too late to clean up the river.A as B what C that 选A 请问不能选what引导主语从句吗?that怎么不对呢,也可以做主语
—— is known to everybody ,it may now be too late to clean up the river.
A as B what C that
教你四个句型
1 As is known to everybody ,it may now be too late to clean up the river.
2 It's known to everybody that it may now be too late to clean up the river.
3 what is known to everybody is that it may now be too late to clean up the river.
4 it is known to everybody to be too late to clean up the river.

答：此题的答案为A
as 在这引导一个非限制性定语从句，修饰后面这句内容。
as 引导的定语从句与 it 作形式主语的主语从句和以 what 引导的主语从句的区别。试比较：
As is known to everybody，the moon travels round the earth once every month.
It is known to everyb...

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答：此题的答案为A
as 在这引导一个非限制性定语从句，修饰后面这句内容。
as 引导的定语从句与 it 作形式主语的主语从句和以 what 引导的主语从句的区别。试比较：
As is known to everybody，the moon travels round the earth once every month.
It is known to everybody that the moon travels round the earth once every month.
What is known to everybody is that the moon travels round the earth once every month.

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What is known to everybody is that it may……
that引导则不能如As 那样置于句首，只能
It man …… the river that is known to everybody,
或
That it may …… the river is known to everybody.
只有AS常用这种句式，且放于主句前后均可，as is done 结构。

前半句是一个定语从句，由于这个定语从句放在了前面所以要用as，如果放在后面的话，应该是：
It may now be too late to clean up the river, which is known to all.
如果选what构成主语从句的话，应该是What is known to everybody is that it may now be too late t...

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前半句是一个定语从句，由于这个定语从句放在了前面所以要用as，如果放在后面的话，应该是：
It may now be too late to clean up the river, which is known to all.
如果选what构成主语从句的话，应该是What is known to everybody is that it may now be too late to clean up the river.因为原句的后半句已经是完整句，所以前面不可能是主语从句。
用that也可以引导主语从句，但是这里不能这样用因为上面提到的这个原因“因为原句的后半句已经是完整句，所以前面不可能是主语从句。”
如果要用that作为句首的话：That it may now be too late to clean up the river is known to everybody.

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As is known to all/somebody,是固定搭配“众所周知，正如- - - 所知”，这个句子实际是表示限制性定语。如果用what的话，句子要这样:What is known to everybody is ---(clause),即What is known to everybody 是整个主语成分，what所引领的是主语从句。that 也是如此使用的。
所以只能是As....

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As is known to all/somebody,是固定搭配“众所周知，正如- - - 所知”，这个句子实际是表示限制性定语。如果用what的话，句子要这样:What is known to everybody is ---(clause),即What is known to everybody 是整个主语成分，what所引领的是主语从句。that 也是如此使用的。
所以只能是As.

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汗。
先弄清楚什么叫主语从句吧。。。
这儿是要一个非限制性定语从句的引导词，只有as才行。what,that都不能引导非限制性定语从句。

相信我 选A 百分百正确