Tom's teacher lets him () a song in the class.
应该是:sing
Tom's teacher lets him (sing) a song in the class.
意思是:Tom的老师请Tom在课堂上唱了一首歌.
Tom's teacher lets him () a song in the class.
应该是:sing
Tom's teacher lets him (sing) a song in the class.
意思是:Tom的老师请Tom在课堂上唱了一首歌.