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. President Hu Jintao left Beijing on Monday, April 12, 2010, on 10-day, four-nation trip to attend Nuclear Security Summit in Washington. A. a; the B. the; the C. a; a D. the; a

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