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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 大学估计国际生的生活成本一年8450美元,这对于有些人来说是一个负担.

解答 答案:A
分析句式可知,"estimates that"后是一个宾语从句,从句的主语为"living expenses"意为"生活成本"为可数名词,所以谓语用复数"are","which _____ a burden for some of them"是which引导一个非限制性定语从句,指"这样一件事情",谓语用单数"is".

点评 考查主谓一致,考生需对句子结构进行分析,找出句子的主语,特别which引导非限制定语从句,指一件事情的是谓语需用单数.

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