问题补充：
He insisted that he nothing wrong and free .
A. should do ; should be set
B. should do; had been set
C. had done; should be set
D. had done; had been set[
答案：
A. should do ; should be set
B. should do; had been set
(答案→)C. had done; should be set
D. had done; had been set[
解析：考查动词用法。Insist作“坚持认为”讲，用真实语气，作“坚持要求”讲，用虚拟语气。句意：他坚持认为他什么也没有做错，并坚持要求释放。
