◎ 题干
— Did you go to his birthday party last night?      
— No, I____, but I had some extra work to finish.      
[     ]
A. must have     
B. could have        
C. could          
D. ought to
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Did you go to his birthday party last night?— No, I____, but I had some extra work to finish. [ ]A. must haveB. could haveC. could D. ought to …”主要考查了你对  【虚拟语气】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。