一道英语单选题,The telephone,_____was invented by Alexander Graham

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一道英语单选题,
The telephone,_____was invented by Alexander Graham Bell.
A.as is known by us B.which we know C.as we know it D.as we know
书上给的参考答案是C,可我不明白为什么,我觉得四个选项都可以,

as is known to us
不选B 是因为这里的telephone 是泛指,不是单独的哪一个
至于C和D
As we know和as we know it 请大家先来对比下面这组句子. 1.a. Life, as we know, needs water and oxygen. b. Life as we know it needs water and oxygen. 解析：在a句中,as引导的是一个非限制性定语从句,as所指代的先行词就是整个主句“life needs water and oxygen”,此时as在从句中充当的是know的宾语.对于a句,我们可以把as从句移到句首,说成：“As we know, life needs water and oxygen.”也可以将其改写成宾语从句：“We know that life needs water and oxygen.”从宾语从句我们更容易看出来,从句中know的宾语是“life needs water and oxygen”. 在b句中,as引导的是一个方式状语从句,而不是非限制性定语从句.As后面接的是一个完整的陈述句“we know it”,因此as没有指代任何成分,也不充当从句的句子成分,只起到连词的作用.不过,as从句中的代词it指代as前面的名词life.因此,as从句的谓语动词know的宾语就是life.就从句的位置而言,b句中的as从句一般不会放在句首,比如我们不能说：“As we know it, life needs water and oxygen.”

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