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13. Engineers________the finished bionic contact lenses on rabbits for up to twenty minutes. A. have yet tested B. have already tested C. have performed D. have done 15. Wearable sensors, such as the Fitbit, Nike FuelBand and Jawbone UP,________the most important part of the fitness world for the last few years. (Giải + cấu trúc câu) A. become B. becomes C. have become D. has become
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