单项选择题

A．Good luck.
B．His hard work.
C．His friend Paul.
D．Good timing.
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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.
A．Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or more.
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.
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