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

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