Had they known what was coming next, they________   second thoughts.
A．may haveB．could haveC．must have hadD．might have had
D
【考點】虛擬語氣中的情態(tài)動詞
本句是一個倒裝句，可還原為：if they had known what was coming next, they might have had second thought。根據(jù)had known提示，可知是與過去事實相反，因此虛擬語氣主句中應(yīng)該用would/might +have done，由此可見答案D符合語境。
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