单项选择题

When I was 20 years old I studied in ______ university.

A．/
B．a
C．an
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单项选择题
— Will you please ______ your radio a little I can hardly go to sleep. — Oh, sorry.
A．turn off
B．turn down
C．turn up
单项选择题
______I have never been to Beijing, I know about it from the book.
A．Though
B．And
C．So
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