求救OG11th-9和Prep1-28的比较

OG 11-9 即大全677

9.    Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.

(A) are visible as dark spots on the surface of the Sun but have never been sighted on

(B) are visible as dark spots that never have been sighted on the surface of the Sun

(C) appear on the surface of the Sun as dark spots although never sighted at

(D) appear as dark spots on the surface of the Sun, although never having been sighted at

(E) appear as dark spots on the Sun’s surface, which have never been sighted on

大全的答案是C，OG的答案是A

OG解释C时说，although后应该接完整的句子，而C中没有。

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

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

而Prep1-28破解中的这道题，答案是E。

although后面也没有跟完整的句子啊。。。

呜呼，呼唤NN解答~~~

请问这个修饰对象sunspot有什么问题呢？

有修饰dark spot的歧义

呜呜，有道理，这么说来，although后面不加句子也不一定错的咯~

(A) are visible as dark spots on the surface of the Sun but have never been sighted on

(B) are visible as dark spots that never have been sighted on the surface of the Sun

(C) appear on the surface of the Sun as dark spots although never sighted at

(D) appear as dark spots on the surface of the Sun, although never having been sighted at

(E) appear as dark spots on the Sun’s surface, which have never been sighted on

我觉得AC的区别应该是have never been sighted和never sighted 的区别。

A中，but连接两个平行结构的表达，即are visible as dark spots on the surface of the Sun 和have never been sighted on the Sun’s poles or equator. 而havenever been意思是“至今还没有太阳两极和赤道附近出现”，have been强调对现在的影响。

而C中的一般过去式则不能表达出“从过去到现在都没有出现的意思”而是表示“在过去某一时间点出现过”，没有了这一个持续性就是原题的逻辑意思错误了。

此外，这两道题在每个句子中起的作用不一样。我一般就是读意思，lz吧正确选项带入，仔细体会一下逻辑意思。