摘要:第一节单项填空(共15小题,每小题1分.满分15分) 从每题所给的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.In.America.if friend has invited you to drop by anytime.it is best to call before visiting to make sure it is convenient for him. A.a,a B.the,a C.a,不填 D.the,不填

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