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第三部分英语知识运用（共两节，满分45）第一节完形填空（共20小题；每小题15分，满分30分）阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）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。
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