________ is all known to all, water is ________ hydrogen and oxygen．

[　　]
A．

As; making

B．

It; made up of

C．

As; composed of

D．

Which; consisted of

答案：C
解析：

As is known to all是一個定語從句，并不是It is known to all that…結(jié)構(gòu)。which引導(dǎo)的定語從句不能放在句首。be composed of, be made up of和consist of均意為“由……組成”。


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