摘要：第一节:单项填空(共l5小题,每小题l分.满分l5分) 从A.B.C.D四个选项中.选出可以填人空白处的最佳选项.并在答题卡上将该项涂黑21. Believing that everyone can make world better place on a daily basis, Tom plays his part in helping others. A. /, a B. the, / C. the, a D. the, the
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