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    We knock _____people’s doors, and they usually give us some candy _____ a treat.

    A. on, to           B, at, to           C. on, as           D. on, on

     

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    We knock _____people’s doors, and they usually give us some candy _____ a treat.
    A. on, to           B, at, to           C. on, as           D. on, on

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    Please knock _______ the door before you come in.


    1. A.
      at
    2. B.
      in
    3. C.
      to
    4. D.
      of

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    We knock _____people’s doors, and they usually give us some candy _____ a treat


    1. A.
      on, to
    2. B.
      , at, to
    3. C.
      on, as
    4. D.
      on, on

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    Please knock on the door before you _____ the room.   
    [     ]
    A. entered             
    B. pushed        
    C. noticed          
    D. counted 

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