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

分析 句意為：如果他們早知道接下來所發(fā)生的事，他們可能已經(jīng)改變想法了．

解答 答案：D 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(shí)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．

點(diǎn)評 在虛擬條件狀語中如果有were，should，had這三個詞，通常將if省略，主語提前，變成"were，should，had+主語"的形式．

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