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    Scarcely down when a knock at the door. A．had he sat; did he hear B．he had sat; did he hear C．he had sat; he heard D．had he sat; he heard 【查看更多】

     

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    Scarcely ________ down when ________ a knock at the door．


    1. A.
      had he sat；did he hear
    2. B.
      he had sat；did he hear
    3. C.
      he had sat；he heard
    4. D.
      had he sat；he heard

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