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
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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
单项选择题
The background music in an assembly line is designed ______.
A．being not listened to
B．not being listened to
C．to be not listened to
D．not to be listened to
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