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Which of the following sentences is grammatically INCORRECT？A．Twenty years in prison were

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Which of the following sentences is grammatically INCORRECT？

A．Twenty years in prison were the penalty he had to pay.

B．Acoustics is a branch of science that is growing fast.

C．Is draughts a game for two？

D．Good cutlery is expensive.

请帮忙给出正确答案和分析，谢谢！

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  • 正确答案：A
    主谓一致。B项主语是“声学”，-s结尾的学科名词，谓语动词使用单数；C项主语是“跳棋”，一s结尾的游戏名词，谓语动词使用单数；D项主语是“刀叉餐具”，集体名词，谓语动词使用单数。A项主语中心词是years，虽然是表示时间的复数名词，但往往被看作一个整体，谓语动词应采取单数形式。