单项选择题

Beijing is one of the ______ in the world.

A．large city
B．largest cities
C．largest city
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单项选择题
--How can I get there--You can get there ______ bike.
A．on
B．by
C．in
单项选择题
Let's meet at the school gate ______ 7: 30.
A．in
B．at
C．on
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