Without the air to hold some of the sun's heat, the earth at night ________, too cold for us to live.

A.would be freezing cold

B.would be freezing coldly

C.would be frozen cold

D.can freeze coldly

答案及解析： A

解析：

前半句是由without短语所表示的含蓄条件句，整个句子所表达的和事实相反，需用虚拟语气．指现在的情况，用would/could/should/might+动词原形；

freezing相当于副词，修饰cold．句意为“如果没有空气保存一部分太阳的热量，夜晚地球上就会太冷，令人无法居住．”