Look,the boy is falling _____the bike.
问题描述：
Look,the boy is falling _____the bike.
答
Look,the boy is falling down the bike
答
Look,the boy is falling off the bike.falling off 是固定搭配.Noun1.a noticeable deterioration in performance or quality; "the team went into a slump"; "a gradual slack in output"; "a drop-off in attend...