- Do you hear someone knocking at the door? - Yes, I did. I heard him three times. A. kno——青夏教育精英家教网—

摘要： - 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

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从所给的四个选项中选择最佳答案

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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