单项选择题

The city serves as an important railroad ______ and industrial and convention center.

A．junction
B．network
C．link
D．conjunction
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单项选择题
Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed ______ .
A．would have produced
B．had produced
C．have been produced
D．had been produced
单项选择题
It's late; I think I must ______ now.
A．turn back to
B．turn down
C．turn on
D．turn in
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