题目内容

17．Had they known what was coming next，they ________ second thoughts．（　　）
A．may haveB．could haveC．must have hadD．might have had

分析 句意为：如果他们早知道接下来所发生的事，他们可能已经改变想法了．

解答 答案：D 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．

点评 在虚拟条件状语中如果有were，should，had这三个词，通常将if省略，主语提前，变成"were，should，had+主语"的形式．

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