【題目】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

【解析】本題考查虛擬語(yǔ)氣的用法。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(jiàn)答案D符合語(yǔ)境。

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