单选题The tourist is forbidden to enter a country if he does not have a (an) _____ passport.AoperativeBvalidCeffectiveDefficient
单选题
The tourist is forbidden to enter a country if he does not have a (an) _____ passport.
A
operative
B
valid
C
effective
D
efficient
参考解析
解析：
句意：游客如果没有一个国家的有效护照，则会被禁止进入该国。四个选项都有“有效”之意，但用于不同场合。valid（证件等）合法的，有效的。operative（法规，规定等）有效的。effective（方式，方法等）有效的。efficient（方法）有效的，效率高的，（人）有能力的。
句意：游客如果没有一个国家的有效护照，则会被禁止进入该国。四个选项都有“有效”之意，但用于不同场合。valid（证件等）合法的，有效的。operative（法规，规定等）有效的。effective（方式，方法等）有效的。efficient（方法）有效的，效率高的，（人）有能力的。
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