单项选择题

______ ,this book will sell like not cakes.

A．Once printed
B．Printed
C．Having printed once
D．After to print
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With the introduction of the electronic computer, there is no complicated problem ______ can be solved quickly.
A．that
B．which
C．but
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Sit ______ you like.
A．however
B．wherever
C．but
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