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6. Such a mistake could have been avoided. Unfortunately, he ________ the mistake again and again. A. repeated B. would repeat C. had repeated D. would have repeated 7. Did you find the missing couple in the mountain yesterday? No, but we ________ to get in touch with them ever since. A. have tried B. have been trying C. had tried D. had been trying 8. I would have come sooner but I ________ that they were waiting. A. havent known B. hadnt known C. dont know D. didnt know 9. －Oh, its you, Steve! I ________ you. －No surprising. Ive just had my hair cut. A. dont recognize B. havent recognized C. didnt recognize D. hadnt recognized 10. Im glad to see that you ________ a lot of progress since I ________ you last. A. will make; have met B. have been making; met C. had made; met D. have made; meeting | 
