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    - Do you hear someone knocking at the door? - Yes, I did. I heard him three times. A. knocking B. knocked C. being knocking D. knock 【查看更多】

     

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    Do you hear someone knocking at the door?

    Yes, I did. I heard him ______ three times.　　　

    [　　]

    A．knocked　　　B．knocking　　　　C．knock　　　D．being knocking

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