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    (2013·安徽省芜湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years.

    A．is increasing

    B．are increasing

    C．has been increasing

    D．have been increasing

     

    C

    【解析】选C　考查时态和主谓一致。句意：最近一项研究表明，在过去五年里，吸烟者人数急剧上升。the number of后接复数名词作主语，谓语动词则用第三人称单数；时间状语over the past five years表明用现在完成进行时。

     

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