为什么选D ___no gravity,there would be no air around the eartha if th_英语解答

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

人气：202 ℃　时间：2020-05-17 13:26:34

解答

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.