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【单选题】In some countries there is a fixed charge for personal services. A certain percentage may be added to the bill at a hotel or restaurant "for the service". In other places the customer may be expected ...
A.
"Extra" is a fixed charge in some cities.
B.
"Extra" is similar to a tip in some cases.
C.
If the "extra" is paid, one doesn"t tip any more.
D.
Some hotels require people to pay a service charge.