题目内容

—Could you come to my birthday party?
—Sorry, I ________.
A. couldn’t           B. can’t          C. can
B

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。
点评：情态动词的考查是初中英语考查的重点，平时学习中一定要熟记这些词的基本词义及用法上的不同，注意其用法及在句子中表达语气的不同。考试中结合语境选择合适答案。
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