While having our dinner, .
A. the door bell rang
B. our newspapers came to the door
C. we heard the door bell ringing
D. the postman brought several letters to us
网友回答
A. the door bell rang
B. our newspapers came to the door
(答案→)C. we heard the door bell ringing
D. the postman brought several letters to us
解析：观察句子结构从句为连词+现在分词，说明是状语从句的省略，根据状语从句的省略的条件：主句和从句的主语应一致，又因为是现在分词，故主句的主语应和have构成主动关系，故排除AB，CD主语为人，均可以和have构成主动关系，但D答案不合逻辑，句意。句意，当我们正在吃饭时，门铃响了。