◎ 题干
— Has the doctor arrived yet?
— No, she _____ an hour ago.
[     ]
A. has to come
B. ought to have come 
C. should come
D. used to come
◎ 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“— Has the doctor arrived yet? — No, she _____ an hour ago. [ ]A. has to come B. ought to have comeC. should come D. used to come …”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。