By the time I left the concert，my ears ，with plex feelings filling my heart．
A. had rung
B. were ringing
C. were to ring
D. rang
网友回答
A. had rung
(答案→)B. were ringing
C. were to ring
D. rang
解析：句意：到我离开音乐会时，我的耳朵还在响，复杂的感情装满了我的心。表示过去某一时间正在进行的动作，用过去进行时，选B。