题目内容

(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
选D　根据“Had they known ...”可知，此处是省略了if的条件句，表示与过去事实相反的假设，所以主句用should/would/could/might＋have done结构，故D项正确。
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