单项选择题

A．Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or more.
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单项选择题
A．The role of inland waterways in the nation’’s growth.B．The development of New York City as a seaport.C．The growth of the railroads.D．The disappearance of the canal system.
A．The role of inland waterways in the nation’’s growth.
B．The development of New York City as a seaport.
C．The growth of the railroads.
D．The disappearance of the canal system.
单项选择题
A．Because they have a driving license.B．Because they have received special training.C．Because the traffic conditions in London are good.D．Because the traffic system of the city is not very complex.
A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic conditions in London are good.
D．Because the traffic system of the city is not very complex.
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