I heard Tom ____(sing) a English song in the next

Question

I heard Tom ____(sing) a English song in the next room just now. 请给出理由，谢谢

Answer 1

sing just now刚刚，表示他唱歌的动作已经结束。
hear + sb + do 表示听到某人所做的是已经结束，是全过程
hear +sb +doing 表示听到某人正在做某事本回答被网友采纳

Answer 2

singing
刚才我听见他在唱歌，听见的那一刻，他正在唱本回答被提问者采纳

Answer 3

singing，ing表听见他正在唱，而原型是指听见他唱的整个过程

Answer 4

sing