(2013·高考湖南卷)The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them.
A．a(chǎn)re；isB．a(chǎn)re；are
C．is；areD．is；is
A
選A。題干的意思是：“這所大學(xué)估計(jì)，國際學(xué)生的生活費(fèi)用每年大約8 450美元，這對(duì)他們中的一些學(xué)生來說是一個(gè)負(fù)擔(dān)�！钡谝粋�(gè)空的主語為living expenses“生活費(fèi)用”，所以謂語動(dòng)詞用復(fù)數(shù)形式；“which________a burden for some of them”是一個(gè)非限制性定語從句，which指代前面的“生活費(fèi)用高”這件事，故此處謂語動(dòng)詞用第三人稱單數(shù)形式。
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