Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turn
问题描述：
Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turn
harmful gases from the air ______ oxygen for us to breathe.英语学案上的题
答
填into.有两个地方需要填那就在turn前填上can：Trees can turn harmful gases from the air into oxygen for us to breathe.树木能把空气中的废气变成氧气供我们呼吸。