单项选择题

After the new technique was introduced, the factory produced ______ tractors in 1988 as the year before.

A．as twice many
B．as many twice
C．twice as many
D．twice many as
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There are flowers on ______ side of the street.
A．both
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C．two
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Training astronauts ______ not an easy thing.
A．are
B．is
C．were
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