_______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。
Tounderstandthesentence,youshouldanalyzeitsparts________.
Theclothhadanaturallookwhichperfectly________theimageLaurasought.
句子写作：”HappyChristmas“hesaid.
Ifanearthquakeoccurred，someoftheone-storeyhouses________.
句子写作：Thepianoplayerbegantosingloudly.
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