【正文】
14. A. if B. whether C. when D. unless 15. A. So B. But C. Though D. Thus 16. A. little B. few C. many D. much 17. A. upstairs B. downstairs C. over D. in 18. A. another B. one C. no D. the 19. A. this B. that C. so D. thus 20. A. can I do B. can I C. I can do D. I can 答案: 1. D 11. C 2. B 12. B 3. B 13. D 4. C 14. A 5. A 15. B 6. B 16. B 7. C 17. A 8. A 18. A 9. D 19. C 10. A 20. C