Answer:
11. Studied
12. will study
13. was/were studying
14. review
15. is/are reviewing
16. had studied
17. has/have reviewed
18. will have reviewed
19. has/have been reviewing
20. had been reviewing
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Answers & Comments
Answer:
11. Studied
12. will study
13. was/were studying
14. review
15. is/are reviewing
16. had studied
17. has/have reviewed
18. will have reviewed
19. has/have been reviewing
20. had been reviewing