单项选择题

You ______ talk so loud in the library.

A．needn't
B．may not
C．mustn't
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Do you know where the story of the film ______ It took place on an international train.
A．happened
B．went
C．on
单项选择题
The horse is getting old and cannot run ______ it did.
A．as fast as
B．as faster as
C．as faster than
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