-I knocked at your door, but nobody answer. -You should the door bell. A. try touching ——青夏教育精英家教网—

摘要： -I knocked at your door, but nobody answer. -You should the door bell. A. try touching B. tried to touch C. have tried touching D. have tried to touch

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—I knocked at your door, but nobody answer.
—You should _____ the door bell.
A. try touching B. tried to touch C. have tried touching D. have tried to touch

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