Charles is believed_______ the floor yesterday; he is always helping others silently.

A.to sweep B. to have swept

C. having swept D. Swept

B

【解析】試題分析：考查固定句型；sb be believed to have done sth 某人被認(rèn)為做了某事，用不定式的完成式表示該動(dòng)作先于主句動(dòng)作完成。句意：人們認(rèn)為查理 昨天掃了地，因?yàn)樗倳?huì)默默地幫助別人。故選 B。

考點(diǎn)：考查固定句型

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