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.Every possible means to prevent the crash , but the computer doesn’t still work. A.is used B.are used C.has been used D.have been used

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