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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单项选择题
—I usually go there by train. —Why not______ by boat for a change
A．to try going
B．trying to go
C．to try and go
D．try going
单项选择题
Tell him ______the window.
A．to shut not
B．not to shut
C．to not shut
D．not shut
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