11 A taught B believed C tried D allowed
12 A was B had C could D did
13 A studies B events C developments D decisions
14 A feared B said C suggested D expected
15 A if B while C because D although
参考答案:
1. A 2. B 3. D 4. C 5. A
6. D 7. A 8. C 9. C 10. C
11. B 12. D 13. A 14. B 15. B
