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Without the air to hold some of the sun’s heat, the earth at night_____very cold, too cold for us to live.
A.will beB.would have beenC.isD.would be
D
考查虚拟语气。本题考查与现在事实相反的虚拟语气,故用would + v原形。句意::(如果)没有大气保存太阳部分的热量,地球的晚上也会刺骨的寒冷,冷得对我们来说无法居住。
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