单项选择题

With the introduction of the electronic computer, there is no complicated problem () can be solved quickly.

A．that
B．which
C．but
D．as

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单项选择题
The disease has completely () in this country.

A．died out
B．died down
C．died away
D．died off
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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