连词+分词的结构是不是必错选项？

xiangyu4255

OG SC Sample Questions:
14. 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
其中C选项，答案给出如下解释：
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.

可见Athough+sighted存在问题！
但是连词+分词（有时也理解为省略从句主语和系动词的结构）在日常英语中应该是认可的，该题的答案是否意味着GMAC不认可该结构呢？

此外，OG SC中另一题：
98. Even though Clovis points, spear points with longitudinal grooves chipped onto their faces, have been found all over North America, they are named for the New Mexico site where they were fi rst discovered
in 1932.
(B) Although named for the New Mexico site where first discovered in 1932, Clovis points are spear points of longitudinal grooves chipped onto their faces and have been found all over North America.

答案认为：
B The sentence structure indicates that the expected incompatibility is between the geographically based name of the points and their physical properties, which makes no sense; where discovered is missing a subject— the correct form is where they were fi rst discovered.

可见，Where+分词的形式也被禁止！

masushuang

36.Although eradicated in the United States, polio continues else where and could be brought into the country by visitors.

35.  Along with the drop in producer prices announced yesterday,the strong retail sales figures released today seem to indicate that the economy, although growing slowly,is not nearing a recession.

xiangyu4255

囧，这样看的话，OG第14题的答案有点牵强啊，这不是自相矛盾么？到底这个用法对不对呢==

ashleych

我也在困惑中，等待NN解答

trackofheart

像although这样的连词并不是一旦加分词就是错的，一般有这几种情况：
1.although+分词....., S（当然就是与分词对应的主语了）+V+O
2.S,although+分词.....,V+O
以上两种情况是连词+分词的表达是没有问题的，请看一下1楼NN给的例子就可以明白了。
一般错误地表达，经常出现在SVO+although（这时although后面一定是完整句子），当然像一般的情况Although+SVO,主句（SVO）肯定是不用多说的了，必然对啊。。。

trackofheart

以上是我遇到的题目中一些用法，希望NN补充哈