练习册

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    -Why do you look so worried? -My computer broke down and my essay since. A．has been left unfinished B．has left to finish C．was left to finish D．had been left unfinished 解析:选A.考查动词的时态和语态.由broke down和since可知时态用现在完成时.且主语与谓语动词之间是动宾关系.故用被动语态. 【查看更多】

     

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