摘要:第一节 单项填空 ( 共20小题,每小题1分.满分20分 ) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.21. Without the air to hold some of the sun’s heat, the earth at night cold, too cold for us to live. A. would be freezing B. will be frozen C. would be frozen D. will freezingly

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