摘要:第一节 单选填空(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.21.At first, it seemed that everything went well, but all of sudden, the ship hit iceberg. A.a; an B.a; the C.the; the D./; an

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