卡耐基课程SSD5答案
很好自己做的满分ThisassessmentextendstheAuctionprojecttoallowitemstobegroupedanddisplayedincategories.Registeredusersofthesystemwillhavetheabilitytochooseacategorywhenpostinganadvertisement.Regularusersofthesystemcanfilterthelistofadvertisementsbasedoncategory.Twofiltersexist.Thefirst
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