Tipping is neither encouraged nor mon, although visitors may reward special services if they wish, _________ 10% of the bill is enoughA.whichB.whereC.in whichD.in which case
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D解析这题考查 定语从句的：介词+which+名词的用法，句意是：虽然游客如果愿意可以奖励特殊的服务，但是给小费不被鼓励也不常见，这种情况下，账单的10%足够了。选D。D。