The man in prison insisted that he _________ nothing wrong and _________ set free．
A.had done; should beB.should do; should beC.had done; had beenD.should do; had been在线课程A
insist后的从句谓语是“should+动词原形”这样的虚拟语气，要看该谓语动词所表示的含义。一般说来，若该谓语动词所表示的动作尚未发生，或尚未成为事实，则用虚拟语气；若该谓语动词所表示的动作已经发生，或已经成为事实，则不用虚拟语气。