While having our dinner, _______. A.the door bell rangB.our newspapers came to the door C.we heard the door bell ringingD.the postman brought several letters to us
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C解析试题分析：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