his grandpa often hears him ——(sing)in his own room.横线上填入适当形式

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his grandpa often hears him ——(sing)in his own room.横线上填入适当形式
his grandpa often hears him ——(sing)in his own room.横线上填入适当形式

his grandpa often hears him ——(sing)in his own room.横线上填入适当形式
sing
【解析:often see/hear sb do】
拓展:see/hear sb doing +某个时间点或时间段
【俊狼猎英】

应该填写
singing
他奶奶常听到他在自己房间唱歌
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his grandpa often hears him (sing) in his own room.
填不带to的不定式sing。因为是often听,【不是某时】正在听

横线上应该填singing