D. might have had

　　【解析】本句是一个倒装句，可还原为：if they had known what was coming next, they might have had second thought。根据had known提示，可知是与过去事实相反，因此虚拟语气主句中应该用would/might +have done，由此可见答案D符合语境。

　　【2017江苏卷】25. There is little doubt in your mind that he is innocent, _______________?【答案】AA. is there B. isn't there C. is he D. isn't he

　　【解析】根据前面there be 句little，，，A项。

　　30. It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather. 【答案】B。 A. who B. that C. where D. before

　　【2017重庆卷】33. The headmaster will not permit the change in the course, nor______ it a thought. 【答案】C

　　A. does he even given

　　B. he even gives

　　C. whether D. he will even given

　　【2017重庆卷】32. It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa

　　【答案】B

　　A. when

　　B. that

　　C. after

　　D. since

　　【2017辽宁卷】32.

　　Not until he retired from teaching three years ago

　　having a holiday abroad. 【答案】DA.

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