单项选择题

How long did the Pony Express Exist

A．61 years.
B．6 months.
C．One year.
D．18 months.
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单项选择题
According to the passage, the Pony Express riders are ________.
A．orphans
B．well over 18
C．skillful can-drivers
D．courageous and brave young men
单项选择题
A series of robberies ________ recently.
A．has been reported
B．has reported
C．have been reported
D．have reported
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