_______isknowntoall，Chinawillbean_______powerfulcountryin20or30years’time.
C
as 可以用来引导一个非限制性定语从句，通常无明显的先行词。 as 指代的是主句陈述的内容。而 as 引导的从句既可以放于句首，也可以放于句末或句中。
句子写作：Thehouse____isstillstanding.
Whataretheparagraphqualities?
Howmanypartsisanarticleusuallycomposedof?Whatarethey?
Howmanypartsdoesascienceandtechnologypaperconsistof?Whatarethey?
Howmanyformscanarticlesberoughlydividedinto?whatarethey?