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You were out enjoying yourself when you ________.

       A. must have studied            B. would have studied

       C. should be studying           D. ought to have been studying

You were out enjoying yourself when you ________.

       A. must have studied            B. would have studied

       C. should be studying           D. ought to have been studying

You were out enjoying yourself when you _________.

　 A. must have studied　　 B. would have studied

　 C. should be studying　　　 D. ought to have been studying