In the morning ,I didn't hear my alarm clock ____ .

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  • going off

    hear sb.doing sth.听见某人正在做某事

    hear sb.do sth.听见某人做某事,指叙述动作本事,不强调“正在做”.

    e.g.I hear somebody singing English songs in the next classroom.我听到隔壁教室有人在唱英文歌.

    I heard someone enter the room and I did not look up to see who it was.我听见 有人进屋,我没有抬头看是谁.