单项选择题

What is the best title for this passage

A．The Future of Transportation.
B．Argonne Develops Maglev Train.
C．The Disadvantages of Commuting by Airplane.
D．Commuting in the Future.
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单项选择题
According to the passage, when could people start using a maglev commercially
A．In 5 years.
B．In 10 years.
C．In 20 years.
D．In more than 20 years.
单项选择题
It ______ me 3 days to have the watch repaired.
A．gave
B．took
C．made
D．kept
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