She and her family hid away for nearly twenty-five months _____ they were discovered.A.AfterB.sinceC.untilD.before
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D解析时态分析：考查before用法。Before在…之前；在句中中要灵活的翻译。句意：在她们被发现之前她和她的家人隐姓埋名了几乎25年。故D正确。考点：考查before用法
点评：Before在…之前；在句中中要灵活的翻译。同时也要注意before的一些固定句型。