I heard some children __(sing) a song just now .
问题描述:
I heard some children __(sing) a song just now .
答
singing,我听见小孩子刚刚正在唱歌,hear sb doing/do sth,听见某人正在做什么
答
后面是just now,所以是singing
答
填singing
hear sb doing sth听到某人正在做某事
just now刚刚
刚刚我听到有孩子在唱歌