题目

题型：不详难度：来源：

Had they known what was coming next, they________  second thoughts.

A．may have

B．could have

C．must have had

D．might have had

答案

D
【考点】虚拟语气中的情态动词

解析

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。