____is well-known is ____light travels faster than sound.A.it,that B.what,/ C .As,that D.whta,that选D,为什么不选其他的,

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____is well-known is ____light travels faster than sound.A.it,that B.what,/ C .As,that D.whta,that选D,为什么不选其他的,
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____is well-known is ____light travels faster than sound.A.it,that B.what,/ C .As,that D.whta,that选D,为什么不选其他的,
____is well-known is ____light travels faster than sound.
A.it,that B.what,/ C .As,that D.whta,that
选D,为什么不选其他的,

____is well-known is ____light travels faster than sound.A.it,that B.what,/ C .As,that D.whta,that选D,为什么不选其他的,
要表达“人人皆知的是,光的速度比声音的快.”
只有D合适.
其他的,如果是A项,应该是:
It is well-known that light travels faster than sound.(it 作形式主语)
如果是C项,则是:
As is well-known,light travels faster than sound.(as 作关系代词)

同时用了两个从句,主语从句和表语从句
一个句子中只能有一个主语,所以A不对,C中As不能引导主语从句
表语从句一定要加先行词that所以B不对