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    精英家教网 > 初中英语 > 题目详情
    There must be someone at the door. I heard a bell         .    

    A. ring  
    B. to ring
    C. ringing  
    D. was ringing
    C
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    科目：初中英语 来源：专项题 题型：单选题

    There must be someone at the door. I heard a bell         .    
    [     ]
    A. ring  
    B. to ring
    C. ringing  
    D. was ringing

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