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which→when
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单项选择题
A．In a library.B．In a bookstore.C．On a sports field.
A．In a library.
B．In a bookstore.
C．On a sports field.
单项选择题
Vienna is a city which is ______.
A．the most beautiful city in Europe
B．so big that it doesn't belong to Austria
C．the richest capital in Europe now
D．a small capital of a large country
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