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
They ______ the history museum last week.
A．visit
B．visited
C．have visited
单项选择题
There's something wrong ______ my bike. Can you help me
A．to
B．for
C．with
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