初级
参考答案:B进入在线模考
题干问题:如果使用电话卡拨打本地电话,你必须怎样?原文最后一段可知:使用国际商务电话卡拨打国内电话,会在标准收费率的基础上另外收费。选项B正是多付钱的意思,extra有“多余的、额外的”意思。故选B。
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