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【单选题】

The tourist is prevented from entering a country if he does not have a (n) passport.
A．operative

B．effective
C．valid
D．efficient
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根据网考网移动考试中心的统计，该试题：

20%的考友选择了A选项

22%的考友选择了B选项

55%的考友选择了C选项

3%的考友选择了D选项

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