单项选择题

If you want to post a letter, you should go to a ______.

A．zoo
B．school
C．post office
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单项选择题
Beijing is one of the ______ in the world.
A．large city
B．largest cities
C．largest city
单项选择题
They ______ the history museum last week.
A．visit
B．visited
C．have visited
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