Question

_____no air and water,there would be no life in the world.

Answer 1

D:Were there

在虚拟语气条件句中从句谓语动词有were, had, should等词,可将if 省略,把 were, had, should 移到主语之前,采取部分倒装

例如：

Were I you, I would try it again. 我是你的话,就再试一次