问题
选择题
----- Believe it or not, my sister and I are twins.
----Oh, you must have had the case ________ you were taken for your sister.
A．which
B．whose
C．where
D．whom
答案
答案：C
考查定语从句的关系词。 当先行词为case, situation,point等抽象的地点名词，且在句中作状语时，关系词应是where.