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
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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
单项选择题
A clear head is of primary importance in ______ urgent situations like this.
A．dealing
B．disposing
C．coping with
D．proceeding with
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