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Charles is believed_______ the floor yesterday; he is always

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Charles is believed_______ the floor yesterday; he is always helping others silently. 
A.to sweep B.to have swept C.having swept D.swept
Charles is believed_______ the floor yesterday; he is always
B

考查非谓语动词。句意:相信查尔斯昨天已经打扫过地面了。他总是默默地帮助别人。Believe后用不带to的不定式,当变为被动语态时,要加上to表示具体的将要进行的动作,如果动作发生在谓语动词之前,则要用完成时态的不定式。结合语境可知打扫地板发生在相信之前,故选B.