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.
Sunspots are visible as dark spots on the surface of the sunbut have never been sighted on the sun’s poles or equator.
p.s. parallelism is rather flexible... tense is not the determinant.. as long as you have an explaination, that's parallelism..
下面是stacey姐姐對於parallelism的解釋，個人認為蠻instructive的~lz有興趣可以看看~hope that helps As long as you can argue by SOME defense that the sentence preserves parallelism, you're okay. So I could see "She was not a swimmer but went to the pool frequently to sunbathe" or "She did not swim but went to the pool frequently to sunbathe," and either of these would be acceptable. In order for someone to tell you these violated a law of parallelism, that person would have to prove that you couldn't in ANY way claim that these were parallel, and he/she wouldn't be able to prove that. If he/she said "These aren't parallel, because you have a "not NOUN but PAST TENSE VERB in them," you'd just respond that he/she wasn't looking at the right word groupings in the sentence, and that the words could be grouped as "She PAST TENSE VERB PHRASE but PAST TENSE VERB PHRASE" ("She was not a swimmer but went to the pool frequently to sunbathe," where the parts in blue are parallel).
It's really sort of like the associative property in math. Say you had 10*6*3. If you argued that that's 10*18, no one could accuse you of being wrong -- no one could insist that it HAD to be 60*3. Same deal with parallelism -- as long as you can present some way of grouping that preserves parallelism, no one can prove you wrong. It doesn't mean the sentence can't be improved to sound better -- sometimes it can -- and if, on the GMAT or in real life, there's a way to make it sound better, then by all means, go for it.
补充题目：17.Sunspots,vorticesofgas associated withstrong electromagnetic activity,arevisibleasdark soots on the surface of the Sun but have never been sighted on the Sun's poles or equator. (A) arevisibleasdark spots onthe surface ofthe Sunbuthaveneverbeen sighted on (B) arevisibleasdark spots that neverhavebeen sightedonthe surface oftheSun (C) appear onthe surface oftheSunasdark spots althoughnever sighted at (D) appear asdark spots onthe surface oftheSun, althoughneverhavingbeensightedat (E) appear asdark spots ontheSun's surface, whichhaveneverbeen sighted on
Although 引导的是状语从句，关于状语从句的省略有两点要求：1.逻辑主语等于句子主语。2.从句的谓语必须是be，且从句主语和谓语要么同省要么同留。
选项C although never sighted at 如果是省略那么补齐就是 Although sunspots were never sighted at 这样改变了原文意义上的完成时态。
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发表于 2013-1-24 15:52:44
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