问题补充：
The USA is a large country in many different dialects are spoken.
A. that
B. which
C. where
D. it
答案：
A. that
(答案→)B. which
C. where
D. it
解析：本题修饰名词表示的是一个地点，在介词in需用关系词which，故本题选B。
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