Every time_____they met, they would talk several hours together about all of the situations_____ appear in the working world.A.that; whenB.when; whereC.which;whatD./; that
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D解析考查从句。名词短语Every time引导时间状语从句。定语从句That appear in the working world修饰先行词situations,关系代词that指代先行词在句中做主语。句意：每次他们见面，他们都连续几个小时在一起谈论工作中出现的各种情况。