单选题
Which of the following sentences is grammatically INCORRECT?
A、
Ten dollars is not a large sum of money.
B、
Statistics are a branch of mathematics.
C、
All the sheep were grazing on the hillside.
D、
Measles is an infectious disease.
【正确答案】
B
【答案解析】
考查主谓一致。Statistics作“统计学”讲时，谓语动词用单数，因此B项在语法上错误。A项Ten collars看作整体，因此用单数；sheep“绵羊”虽然不以S结尾，却可以表示复数意义；Measles是不可数名词，因此也用单数。
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