单项选择题
A.清洁剂使用不当B.水质含钙量较大C.空气污染造成D.使用时间较长自然损耗
A.May I come inB.HousekeepingC.Laundry serviceD.Is there anybody inside
A.May I come inB.HousekeepingC.I’m waiterD.Room service
A.Room serviceB.Laundry serviceC.Turn down serviceD.Make up room
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