完形填空
1. B.maintain
2. A.when
3. B. weakened
4. D. accepted
5. C. bound
6. B. subject
7. D. applies
8. B. raise
9. A. line
10. B. as
11. A. so
12. C. upset
13. C. cultivate
14. D. tied
15. A. concepts
16. C. shapes
17. A. dismissed
18. C. address
19. D. accountable
20. D. as a result
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