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?cè)缰澜酉聛?lái)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(gè)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(guò)去事實(shí)相反，因此虛擬語(yǔ)氣主句中應(yīng)該用would/might have done，由此可見答案D符合語(yǔ)境．

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

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