Thetouristispreventedfromenteringacountr yifhedoesnothave________passport.
[A]anoperative
[B]avalid
[C]anefficient
[D]aneffective
正确答案：B
![The tourist is prevented from entering a country if he does not have ________ passport.[A]](http://www.mshxw.com/aiimages/29/21474.png "The tourist is prevented from entering a country if he does not have ________ passport.[A]")
Thetouristispreventedfromenteringacountr yifhedoesnothave________passport.
[A]anoperative
[B]avalid
[C]anefficient
[D]aneffective
正确答案：B上一篇 We have the system of exploitation of man by man. [A] cancelled [B] abolished[C] refuse
下一篇 Britain has the highest _____ of road traffic in the world—over 60 cars for every mile
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