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
Our teacher worked for______ after twelve o'clock.
A． one more hours
B． more one hours
C． another one hour
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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