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【单选题】

A country must always be ______ guard against spies and invaders.
A．in

B．to
C．with
D．on
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根据网考网移动考试中心的统计，该试题：

17%的考友选择了A选项

1%的考友选择了B选项

14%的考友选择了C选项

68%的考友选择了D选项

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