________is known to all,China will be an ________ and powerful country in 20 or 30 years' time.
A.That;advancing
B.This;advanced
C.As;advanced
D.It;advancing
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C解析关系代词as引导的非限制性定语从句,它的先行词是一个句子,而不是一个名词或代词,从句修饰或补充整个主句的内容,且从句可置于句首,本题中关系代词as在从句中作主语。advancing:发展中的;advanced:发达的。