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. He couldn’t remember when he first listened to U.S. President Obama’s speech, but he was sure it was Monday because everybody was at work. A. /, the B. the, / C. a, / D. /, a

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