问题
选择题
We have heard of many cases _______ some citizens ，especially some famous people， have suffered because personal information had been leaked.
A．why
B．which
C．as
D．where
答案
答案：D
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。