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【单选题】
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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根据网考网移动考试中心的统计,该试题:
4%
的考友选择了A选项
9%
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6%
的考友选择了C选项
81%
的考友选择了D选项
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