a new hospital is being built near our school .that means dinasaur lived long before human beings appeared .这两句为什么加 being
问题描述：
a new hospital is being built near our school .that means dinasaur lived long before human beings appeared .这两句为什么加 being
答
第一个是被动语态的进行时表示正在建造的新医院在我们学校附近.第二个human beings是固定词组表示人类