2. 外语
  3. The tourist is forbidden to enter a country if he does not have a (an) ______ passport.

The tourist is forbidden to enter a country if he does not have a (an) ______ passport.

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问题 The tourist is forbidden to enter a country if he does not have a (an) ______ passport.
选项 A、operative
B、valid
C、effective
D、efficient
答案B
解析 valid意为“有效的，合法的”，通常指证件等合法、有效，如：This train ticket is valid for three months．这张火车票三个月内有效。operative指法律、法规、规定等“有效的”，如：This law be- came operative on May 1．这条法律5月1日生效。effective常指方法或措施有效，强调能达到预期效果，如：We should take effective measures to solve this problem．我们应采取切
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