摘要:第一节 单项填空(共20小题,每小题1分.满分20分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳答案.21. As Susan stared at piles of plastic in her recycling bin, strong sense of responsibility made her stick to her recycling work. A. 不填 ; 不填 B. 不填 ; a C. the ; a D. the ; the

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