题目内容
The university estimates that living expenses for international students ______ around $8,450 a year, which ____ a burden for some of them.
A are；are B. is；are C. is；is D. are；is
D
解析试题分析：考查主谓一致，建议：这个大学估计国际生的生活费用是每年8,450美元，这对他们一些人来说是沉重的负担。第一空前面的主语是living expenses，所以谓语是复数，第二空的先行词是$8,450 a year,表示金钱，时间长度等，谓语是单数，选D。
考点：考查主谓一致
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