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

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In the morning ,I didn't hear my alarm clock ____ .
空里应该填going off还是go off?为什么?
In the morning ,I didn't hear my alarm clock ____ .
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.