参考答案一、1. goes 2. seems 3. are playing 4. was listening 5. is raining 6. will bring 7. took 8. would come 9. has left 10.lost 11. sat 12. hasn't eaten 13. will go 14. is 15. comes 16. did buy 17. have been 18. were doing 19. does cost 二、1. A 2. B 3. B 4. D 5. C 6. A 7. D 8. C 9. A 10. B 11. D 12. C 13. C 14. B 15. A 16.A 17.B 18.A 三、1. B 2. A 3. A 4. A 5. C 6. C 7. B 8. C 9. A 10. C 11. B 12. C 13. B 14. D 15. D 16. B 17. D 18. A 19. B 20. A 21. B 22.A 23. B 24. B 25. C 26. B 27. C 28. B 29. C 30. C