3．The university estimates that living expenses for international students _____ some﹩8，450a year，which _____ a burden for some of them．（　�。�
A．are； isB．are； areC．is； areD．is； is

分析 大學(xué)估計(jì)國(guó)際生的生活成本一年8450美元，這對(duì)于有些人來說是一個(gè)負(fù)擔(dān)．

解答 答案：A
分析句式可知，"estimates that"后是一個(gè)賓語從句，從句的主語為"living expenses"意為"生活成本"為可數(shù)名詞，所以謂語用復(fù)數(shù)"are"，"which _____ a burden for some of them"是which引導(dǎo)一個(gè)非限制性定語從句，指"這樣一件事情"，謂語用單數(shù)"is"．

點(diǎn)評(píng) 考查主謂一致，考生需對(duì)句子結(jié)構(gòu)進(jìn)行分析，找出句子的主語，特別which引導(dǎo)非限制定語從句，指一件事情的是謂語需用單數(shù)．

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