题目

（湖南省长沙市一中2010届高三第九次月考B篇） We all know that the normal human daily cycle of activity is of some 7—8 hours’ sleep alternation with some 16—17 hours’ wakefulness and that, broadly speaking, the sleep normally coincides with (与一致) the hours of darkness. Our present concern is with how easily and to what extent this cycle can be modified.    The question is no more an academic one. The ease, for example, with which people can change from working in the day to working at night is a question of growing importance in industry where automation2．---He ought to have been warned of the danger．---        ，but he wouldn't listen to me．（　　）A．yes，he ought toB．So he wasC．So was heD．So it was with him