PREP1-28

Cenxiao

弱问下，(D)选项中，如果把 is capable of being 换成could 是不是就正确了呢？前半句Although having been eradicated...有错吗？

DesmondWang

我也想问一下，D中的having been eradicated有问题吗，在一个论坛上看到一个说法：
Having + past participle is used to indicate an action that:
-- is completed before the primary action attributed to the modified noun
-- provides context for the primary action attributed to the modified noun
那这里说eradicated发生在continues和be brought前，应该也make sense吧，请牛牛指教！

原题貌似被删了，我再贴一下：
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

快活糖果

关于D选项的could用法找到了Ron的解释
the instance of "could" in the sentence is an example of what i have described as "#2" here:
Usage #1
"Would" is the past tense of "will", and "could" is the past tense of "can".
Usage #2
"Would" and "could" are used to describe hypothetical situations that are not true, or are extremely unlikely. (since these situations are hypothetical -- i.e., they never happened -- they don't really have a timeframe.)
应该就是表达一种可能的情况吧

https://www.manhattanprep.com/gmat/forums/polio-t8775-15.html

C选项的having been eradicated也不是很明白，看Ron的解释也只说到很少有这样的用法，还有其他的解释吗？求指点~https://www.manhattanprep.com/gmat/forums/polio-t8775-45.html