If you are a citizen of one of the European Union countries, you only need to show your passport without checking when you pass ________．A.the customB.a customC.the CustomD.the Customs
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D解析custom用作可数名词，表示“风俗，习俗”，但the Customs表示“海关”，用作单数，C要大写。这句句子的意思是“如果你是欧盟成员国之一的公民，当你通过海关时，只要出示一下护照即可，无需检查。”