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【单选题】

The police warned people to be ______ against burglary during the festival.
A．in guard

B．on guard
C．under guard
D．like guard
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根据网考网移动考试中心的统计，该试题：

22%的考友选择了A选项

62%的考友选择了B选项

10%的考友选择了C选项

6%的考友选择了D选项

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