摘要:第一节 单项填空(共15小题.每小题1分.满分15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.并在答题卡上将该项涂黑.21. When the spaceship traveled above, new-looking earth appeared before us, earth that we had never seen before. A. a; the B. a; an C. the; an D. / ;the

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