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.21. It’s the second time that I in Beijing. What great changes! It’s years since I here last time. A.went; had left B.had been; left C.have been; left D.have; had left

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