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

A．may have B．could have
C．must have hadD．might have had

D

解析試題分析：句意：要是他們?cè)缰澜酉聛硭l(fā)生的事，他們可能已經(jīng)改變想法了。Had they known ...是對(duì)過去情況的虛擬，相當(dāng)于If they had known ...根據(jù)過去情況虛擬語氣的構(gòu)成，主句用 would/should/could/might+have+過去分詞，可知此空要填：might have had 。
考點(diǎn)：考查虛擬語氣

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