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Had they known what was coming next, they________   second thoughts.
A.may haveB.could haveC.must have hadD.might have had
D
【考点】虚拟语气中的情态动词
本句是一个倒装句,可还原为:if they had known what was coming next, they might have had second thought。根据had known提示,可知是与过去事实相反,因此虚拟语气主句中应该用would/might +have done,由此可见答案D符合语境。
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