Source: Official Guide for the GMAT 13th Ed. Sentence Correction; #17 Official Guide for the GMAT 2015 14th Ed. Sentence Correction; #17

1

Sunspots, vortices of gas associated with strong

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.

2 Explanations

1

Are visible and have never been are not parallel....
Can you explain a more in detail the although??

Thank you :)

Mar 4, 2017 • Comment

Adam

Hi there! Actually, "are visible... but never have been..." are in parallel. They're not in the same tense, but they are parallel. A non-parallel version of this would be something like "are visible, ... and never having been ..."

With "although," we would need to restate the subject:

"appear... , although they have never been sighted..."

Please see this blog post for more about "although" clauses:

https://magoosh.com/gmat/2012/participle-phrases-on-the-gmat/

Mar 4, 2017 • Reply

1

Gravatar Mike McGarry, Magoosh Tutor

May 22, 2013 • Comment

Add Your Explanation

You must have a Magoosh account in order to leave an explanation.

Learn More About Magoosh

Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Nova's GRE Prep

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 9.6 Sentence Correction

Section 9.6 Sentence Correction

Improve Your Score

Magoosh GMAT is an affordable online course for studying the GMAT.

Learn More About Magoosh

Share Post

Email

Facebook