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
考查虛擬語氣。本題考查與現(xiàn)在事實(shí)相反的虛擬語氣，故用would + v原形。句意：:(如果)沒有大氣保存太陽部分的熱量,地球的晚上也會刺骨的寒冷,冷得對我們來說無法居住。
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