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four hours. Let’s have a rest. (2020 天津 ) A. are working B. have been working C. worked D. had worked 11. I’m sur e you will do better in the test because you ______ so hard this year. (2020上海春 ) A. studied B. had studied C. will study D. have been studying 12. Tom _______ in the library every night over the last three months. (2020 北京 ) A. works B. worked C. has been working D. had been working 13. The manager ______ the workers how to improve the program since 9 am. (2020全國(guó) II) A. has told B. is telling C. has been telling D. will have told 14. In order to find the missing child, villagers ______ all they can over the past five hours. (2020 安徽 ) A. did B. do C. had done D. have been doing 15. The girl has a great interest in sport and ______ badminton classes twice a week over the last three years. (2020福建 )