While watching television, .
A. the doorbell rang
B. we heard the doorbell ring
C. there was someone knocking at the door
D. we heard the doorbell rung
网友回答
A. the doorbell rang
(答案→)B. we heard the doorbell ring
C. there was someone knocking at the door
D. we heard the doorbell rung
解析：本题考查非谓语动词的用法,现在分词作状语,逻辑主语是句子的主语,因此watch的逻辑主语应该是we,其余两个不能发出watch这个动作。B、D选项中的宾语the doorbell与补足语之间没有被动含义，故选B。