(2012·浙江高考)Had they known what was coming next, they ________ second thoughts.
A．may haveB．could have
C．must have hadD．might have had
D
選D　根據(jù)“Had they known ...”可知，此處是省略了if的條件句，表示與過去事實相反的假設(shè)，所以主句用should/would/could/might＋have done結(jié)構(gòu)，故D項正確。
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