问题补充：
The US is a large country many different dialects are spoken.
A. what
B. when
C. where
D. which
答案：
A. what
B. when
(答案→)C. where
D. which
解析：美国是多种口音并存的国家。关系副词指代country，在定语从句中作地点状语。答案为C。
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