◎ 题干
— Did Mary go to the exhibition yesterday?
— Yes, but she _____ at home.
[     ]
A. may have stayed
B. must stay
C. should have stayed
D. was staying
◎ 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 Mary go to the exhibition yesterday? — Yes, but she _____ at home. [ ]A. may have stayed B. must stay C. should have stayed D. was staying …”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。