请看下面例题(Prep语法笔记_V1.00_Test#1_28):
28. (26003-!-item-!-188;#058&002229)
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 iscapable of being
(E) Although eradicated in the United States, polio continues elsewhere and could be
(E) 正确, 整个句子简洁,表达清晰,用could表达一种可能性
我想,这里的could 表达一种比较相对can 弱的可能吧。