While watching TV, .
A. the doorbell rang
B. the doorbell rings
C. we heard the doorbell ring
D. we heard the doorbell rung
While watching TV, .
A. the doorbell rang
B. the doorbell rings
C. we heard the doorbell ring
D. we heard the doorbell rung
【解析】选C。句意:在看电视的时候, 我们听到门铃响了。由前面分词作状语可知主句主语应与watch的主语保持一致, 又因为the doorbell和ring是主动关系, 故选C。