求助个PREP的问题,想不通啊

Polio, although it is eradicated in the United States, it continues elsewhere and is able to be brought into the country by visitors.

(A) Polio, although it is eradicated in the United States, it continues elsewhere and is able to be

(B) Polio, although eradicated in the United States, it still continues elsewhere and can be

(C) Although still continuing elsewhere, polio has been eradicated in the United States and could be

(D) Although having been eradicated in the United States, polio still continues elsewhere and is capable of being

(E) Although eradicated in the United States, polio continues elsewhere and could be
        

我选D,答案是E.

因为我觉得没有必要用COULD,要用也是CAN啊,

请NN们解答.

Although having been

D选项的用现在完成时有待商榷，而且 Is capable of being 比较主观 而且啰嗦 直接用 can/could be 比较合适

排除A B 应该是 句子结构和 it 的问题吧

A 选项是最ORIGINAL的 所以根据时态有可以把 有HAS 的枪毙掉

我是这么选的-。-

总之 我现在的做题的经验是没有为什么 只有怎么选。。。

很多时候题目没有什么标准 就是 那看似浮云的 感觉。。。