[求助]大全677

结果正确答案是A

OG-11th的答案是A
The correct parallel structure in the original sentence emphasizes the contrast between where sunspots are found (are visible...Sun) and where they are not (have ever beensighted...equator). Sunsports is the subject of the sentence, are is the verb of the first part of the contrast and have been sighted is the verb of the the second. The adjective visible is a complement and is a parallel to the past participle sighted. Both parts of the sentence conclude with phrases indicating location.The contrast itself is indicated by the conjunction but.

A.correct. This sentence clearly and correctly draws a contrast between where sunspots are found and where they are not
B.Changing the modifying clause so that that never...Sun distorts the meaning of the sentence; the contrast is lost
C.Although typically introduces a subordinate clause, which has a subject and a verb, but here there is no subject and sighted is not a complete verb
D.Although usually introduce a subordinate clause, but there is no subject of the clause and having been sighted is not a complete verb phrase
E.The relative pronoun which should immediately follow its referent; here which illogically follows surface, and its intended referent, either sunspots or dark spots, becomes unclear

OG的解释不权威吗？为什么大家会把OG认为错的答案讲出这么多正确的理由来？纳闷ing...

大全中居然有错误答案，这个有点麻烦

怎么我的OG11上答案是A？

A Correct. This sentence clearly and correctly draws a contrast between where sunspots are found and where they are not.

C. Although typically introduces a subordinate clause, which has a subject and a verb, but here there is no subject and sighted is not a complete verb.

那肯定是大全错啊.再犟犟不过OG.

这次正错的郁闷呢,看到OG11这么解释倒是放心乐.

A固然有不舒服的地方: 比如visible as dark spots on the surface of...,这个介词短语有歧义的可能,修饰spots.

但是,C那个sighted没有助动词表达被动,让我怎么也想不通.据说这是传说中的省略be动词了...

anyway不管怎么说,就像有位NN说的,句子改错,在熟悉了基本规则以后,重要的是体会,各种错误的重量级.这估计是需要反复体会的东西...好像词的位置顺序等等,其错误等级就要次于平行啊,主谓一致啊,逻辑意思等等.不能凭轻度等级的错误来否定,要按照错误重量级大到小的排除啊.

我有的题目上来就按小知识点,一下子排除好几个答案,往往正确答案就被排除了....这就是低手的表现吧...

噢,另外一个题外话,不知道管不管用:

XDF上课的时候,讲过,GMAT里面,考单复数,基本上,就是有S的复数,没有S的单数,还有一些一目了然的不可数名词.所以不用太多担心某某词分辨不出来单复数,因此导致无法做主谓一致的题目.

我觉得,这一个思想也可以引申一下,就是: 除了一些超级固定的搭配,比如常见的such as, not only..but also, consider A B等等,request of sb that, prohibit from, forbid to等等,一般不会细致的靠到介词的搭配上去.所以我觉得,这题,如果靠 AT / on 的介词来做题区别,很不靠谱,有点附会的感觉.