单项选择题

A．new software.
B．new computers.
C．new machines.
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单项选择题
A．20 minutesB．30 minutesC．40 minutes
A．20 minutes
B．30 minutes
C．40 minutes
单项选择题
A．It has run out of paperB．The paper has jammedC．It needs a new ink cartriage
A．It has run out of paper
B．The paper has jammed
C．It needs a new ink cartriage
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