单项选择题

The experiment is at a ______ stage—we'll know the result in an hour.

A．critic
B．critical
C．major
D．life-and-death
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单项选择题
The reason we switch to another line of products is ______ they are not selling well.
A．because
B．that
C．since
D．for
单项选择题
Have your files protected when working on the computer, ______ you might have them deleted by accident.
A．while
B．and
C．so
D．or
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