2. 外语
  3. A tourist is prevented from entering a country if he does not have ______ passport.

A tourist is prevented from entering a country if he does not have ______ passport.

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问题 A tourist is prevented from entering a country if he does not have ______ passport.
选项 A、an operative
B、a valid
C、an efficient
D、an effective
答案B
解析 valid意为“(法律上)有效的”，符合题意。operative意为“生效的，开始运转的”；efficient意为“有效率的，效率高的”；effective意为“奏效的”，往往强调具有产生实际或特定效果的能力。
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