Have you ever met with this case in your life you can't understand others even if they have said something several times？A.whereB.whatC.thatD.which
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A解析：考查定语从句。这个定语从句的先行词是this case,后面的定语从句句子很完整，you是主语，understand是谓语动词，others是宾语。故使用关系副词。选项中只有A是关系副词。故A正确。