第一个 由于是 at the moment 就是此刻 所以应该用进行时态 hear sb doing sth.而第二个 at that moment that 指代那个时刻 所以是过去的时间正在唱歌 必须用过去进行时态 was doing
i heard him （）（sing）at that moment i heard he （）（sing）at tha
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