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动词时态和语态精讲精炼14 535. Over the past 30 years，China significant changes in comprehensive national strength thanks to the reform and opening-up policy. A. witnessed B. were witnessing C. has witnessed D. will have witnessed 答案 C 536. --- Ring me at six tomorrow morning, will you? --- Why that early? I ______ . A. will be sleeping B. have slept C. have been sleeping D. will sleep 答案 A 537. —Is Tom still smoking? — No. By next Saturday he _______ for a whole month without smoking a single cigarette. A. will go B. will have gone C. goes D. has been going 答案 B 538. ---Would you like to join us in playing the game? ---I’m sorry, but my homework ______ by now. A. hasn’t finished B. hasn’t been finished C. isn’t finished D. won’t be finished 答案 B | 
