_______ is known to all，China will be an _______ powerful country in 20 or 30 years’ time.
A、That；advancingC
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。
—Whydidn’tyoubuyanewcar?
—IwouldhaveboughtoneifI_______enoughmoney.
Somelinguiststhoughtthatalllanguages______andwereruledbyacommongrammar.
Hermindhadbeen__________intosuchaconditionasshecouldnotverylikelyhaveimaginedpossibleafewmonthssince.
Wearepleasedtosaythatweare______tosupplyyou______thegoodsyouwant.
Welookforwardto______thegoodsinthefourthquarter.
