为什么选D
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
___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
英语人气：590 ℃时间：2020-05-17 13:26:34
优质解答
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.
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