We have heard of many cases _______ some citizens ,especially some famous people, have suffered because personal information had been leaked.A.whyB.whichC.asD.where
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D解析定语从句的先行词cases在此意为“实例,情况”,根据从句的意思“在这些例子中(情境中)……”,先行词在从句中应该担当状语成分,表示in many cases,所以用where 来引导表示地点的定语从句。