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问题详情：单项填空在A、B、C、D四个选项中，选出可以填入空白处的最佳选项。MaryadvisedthatIshouldbuy______iPadformysonasabirthdaypresent.Youngpeoplearedreamingaboutowning______.A.a;itB.a;oneC.an;oneD.an;it【...