单项选择题

The first textbook______ for teaching English as a foreign language came out in the 16th century.

A．have written
B．to be written
C．being written
D．written
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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
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
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