Sir, you should at the red light, but you didn’t.A. stopB. have to stopC. have stoppedD.

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A. stop
B. have to stop
(答案→)C. have stopped
D. not have stopped
解析：考察虚拟语气。句意：先生，你应该在红灯亮时停，但是你没有。表示对已发生的事情的虚拟用shouldn’t have done 故选C。