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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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科目：初中英語 來源：專項題 題型：單選題

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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