（ ）no air or water,there would be no life in the world
问题描述：
（ ）no air or water,there would be no life in the world
______ no air or water,there would be no life in the world.
a.Were there b.There are c.There was d.Is there
答案给的是A,为什么啊 别的选项不可以吗
答
这是虚拟语气的倒装句.原句为：
If there were no air or water,there would be no life in the world.