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—Could you come to my birthday party? —S...

—Could you come to my birthday party?

—Sorry, I ________.

A. couldn’t           B. can’t          C. can

 

B 【解析】 试题分析:can能,能够。Could是can的过去式,用于一般现在时态表示委婉的请求建议等语气。couldn't 是can`t的过去式和虚拟式。在实际应用中,could`t是can`t的礼貌用法,含有不情愿的意思,加上有虚拟的含义,语气较弱。表示否定时can't比couldn't的否定意味更重。句意:你能来参加我的生日聚会吗?——抱歉,我不能。结合语境可知下文表示的是客观上的不能,故选B。 考点:情态动词辨析
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