◎ 题干
Had they known what was coming next, they________ second thoughts.
[     ]
A. may have
B. could have
C. must have had  
D. might have had
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Had they known what was coming next, they________ second thoughts. [ ]A. may haveB. could haveC. must have had D. might have had…”主要考查了你对  【情态动词】【现在完成时】  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。