(2013·安徽省蕪湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years.
A．is increasing
B．a(chǎn)re increasing
C．has been increasing
D．have been increasing
C
選C　考查時態(tài)和主謂一致。句意：最近一項研究表明，在過去五年里，吸煙者人數(shù)急劇上升。the number of后接復數(shù)名詞作主語，謂語動詞則用第三人稱單數(shù)；時間狀語over the past five years表明用現(xiàn)在完成進行時。
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