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    I hear someone at the door. Please go and see who is. A. knock; someone B. knocking; she C. knocking; he D. knocking; it 【查看更多】

     

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    I hear someone ________ at the door, please go and see who ________ is.

    A. knock; it

    B. knocking; it

    C. knocking; he

    D. knock; be

     

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