If city noises are not kept from increasing,people will have to shout to be heart even at the dinner tabble 20 years fro
问题描述:
If city noises are not kept from increasing,people will have to shout to be heart even at the dinner tabble 20 years from now.
为什么是kept不是keep主句不是将来时态从句应用现在时啊
答
这是被动