单项选择题

Have your files protected when working on the computer, ______ you might have them deleted by accident.

A．while
B．so
C．and
D．or
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单项选择题
It was so deep in the night. All was quiet ______ an occasional baby cry in the neighboring building.
A．except for
B．but
C．except
D．beside
单项选择题
The pictures and the song Yesterday Once More all ______ to his mind his previous days in Los Angeles.
A．brought up
B．brought about
C．brought back
D．brought forth
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