为什么选D ___no gravity,there would be no air around the eartha

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为什么选D
___no gravity,there would be no air around the earth
a if there was
b was there
c if there had been
d were there

此题考察虚拟语气的用法.因为不可能没有重力,所以用虚拟语气.现在虚拟语气be动词一律用were,所以a b错误,c 应为if there were,if there had been 为对过去虚拟也不对.were there为if there were的省略倒装形式,故选d 具体虚拟语气的用法可以参考语法书.

为什么选D ___no gravity,there would be no air around the eartha __no gravity,there would be no air around the earth.A;If the There was no air or water,there would be no life in the worl 1,（A ）no air or water,there would be no life in the world ______ no air or water,there would be no life in the world. （）no air or water,there would be no life in the world _____no air and water,there would be no life in the world. without air ,there would be no weather...问个弱弱的问题,no应该在would if there ___no air or water,what___we do A:were;would B:are; There would be no heat or air-conditioning and no toilets in the air would be hard to breathe为什么不用被动 there would be no life without water and air.怎么换特殊疑问句