大全-3-5. A weapons-smuggling incident recently took place in country Y. We all know that Y is a closed society. So Y’s government must have known about the weapons.
Which of the following is an assumption that would make the conclusion above logically correct?
(A) If a government knows about a particular weapons-smuggling incident, it must have intended to use the weapons for its own purposes.
(B) If a government claims that it knew nothing about a particular weapons-smuggling incident, it must have known everything about it.
(C) If a government does not permit weapons to enter a country, it is a closed society.
(D) If a country is a closed society, its government has a large contingent of armed guards patrolling its borders.（E）
(E) If a country is a closed society, its government has knowledge about everything that occurs in the country.
A是由结论推出的一个必要条件，为什么不可以作为结论的一个assumption呢？B如何取非排除呢？
如果把A改成：If a government knows about a particular weapons-smuggling incident,it must have knowledge about everything that occurs in the country.对不对呢？ | 
