____,many centuries had passed before man learned to use fire.A.Since it is known to us all B.As long as it is knownC.As is known to us all D.What is known to us allWhich one?Why?

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____,many centuries had passed before man learned to use fire.A.Since it is known to us all B.As long as it is knownC.As is known to us all D.What is known to us allWhich one?Why?

____,many centuries had passed before man learned to use fire.A.Since it is known to us all B.As long as it is knownC.As is known to us all D.What is known to us allWhich one?Why?
____,many centuries had passed before man learned to use fire.
A.Since it is known to us all B.As long as it is known
C.As is known to us all D.What is known to us all
Which one?Why?

____,many centuries had passed before man learned to use fire.A.Since it is known to us all B.As long as it is knownC.As is known to us all D.What is known to us allWhich one?Why?
选C,但是楼上说的不全对,应该是as 和 which 都可以引导非限定性引导定语从句(有逗号的定语从句),可以指代前面的一句话.但是as有“正如,正像”的意思,可以置于句首句中,which只能是居中

选C ,as 和 what 都可以引导定语从句,指代前面的一句话,值得注意的是as 句首居中都可以,what只能是居中 因为要指代整件事,所以本题只能考虑as 和 what