在2009年的考研英语完形填空中，最佳答案如下：
1. A. However
2. B. Because
3. C. Although
4. D. Therefore
5. A. They
6. B. It
7. C. He
8. D. She
9. A. Which
10. B. That
11. C. Who
12. D. Whom
13. A. In
14. B. On
15. C. At
16. D. For
17. A. With
18. B. By
19. C. Of
20. D. To
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