The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them.                     (2013·湖南，33)
A．a(chǎn)re；isB．a(chǎn)re；are
C．is；areD．is；is
A
A
解析　考查主謂一致。句意為：這所大學(xué)估計(jì)，留學(xué)生的生活費(fèi)用每年大約8 450美元左右，這對(duì)一些學(xué)生來(lái)說(shuō)是一個(gè)負(fù)擔(dān)。第一空的主語(yǔ)為living expenses指“生活費(fèi)用”，謂語(yǔ)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(yǔ)從句，which指代前面一句話，所以此處謂語(yǔ)動(dòng)詞用單數(shù)。
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