For a trade embargo against a particular country to succeed, a high degree of both international accord and ability to prevent goods from entering or leaving that country must be sustained. A total blockade of Patria’s ports is necessary to an embargo, but such an action would be likely to cause international discord over the embargo. The claims above, if true, most strongly support which of the following conclusions? (D) Any trade embargo against Patria would be likely to fail at some time. (E) For a blockade of Patria’s ports to be successful, international opinion must be unanimous. 因果关系 embargo ==> international discord 题目说 For a embargo to succeed a high degree of both international accord and ability to prevent goods from entering or leaving that country must be sustained. E选项只是重复了上面这句话，并没有support到因果关系。 仔细看题目会发现整个题目是有矛盾点的， 举个例子， 为了小明要买到漫画，那妈妈一定要给小明 100元， 但如果小明想要买漫画，那妈妈就不会给小明 100元， 讲白一点，小明就是不可能买到漫画。 D选项就是讲 小明不可能买到漫画 --

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