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11. How can I ever concentrate (集中精力) if you ________ continually ________ me with silly questions? A. haveinterrupted B. had interrupted C. areinterrupting D. wereinterrupting 12. I bought this shirt for 35 yuan yesterday. Its on sale today for only 29. You should have waited. Oh, really? But how ________ I know? A. would B. can C. did D. do 13. Will you go now? Not until I ________ my experiments. A. will finish B. have finished C. will have finished D. had finished 14. Look! Someone has spilt coffee on the carpet. Well, it ________ me. A. isnt B. hasnt been C. hadnt been D. wasnt 15. Did you enjoy your holiday? Yes, its the best holiday I ________ these years. A. had B. have had C. had had D. would have | 
