Modified SC .. question.

[vittalk_usa]

Hi Ron, Stacey,
I have a question on this "modified " sentence, which is parallel to a sentence in the OG.

Darkspots, vortices of color associated with strong volcanic activity, are visible as red spots on the surface of the Jupiter but have never been sighted on the Jupiter’s poles or equator.
(A) are visible as dark spots on the surface of the Jupiter but have never been sighted on
(B) are visible as dark spots that never have been sighted on the surface of the Jupiter
(C) appear on the surface of the Jupiter as dark spots although never sighted at
(D) appear as dark spots on the surface of the Jupiter, although never having been sighted at
(E) appear as dark spots on the Juipter’s surface, which have never been sighted on

My question is dont we need to have a pronoun between the 'but' and 'have' ?
eg.
Darkspots, vortices of color associated with strong volcanic activity, are visible as red spots on the surface of the Jupiter but they have never been sighted on the Jupiter’s poles or equator

Pls explain.
The OA is A

[RonPurewal]

My question is dont we need to have a pronoun between the 'but' and 'have' ?

that's not the right question to ask. the right question to ask is, WHY don't we need a pronoun?

the answer to your question, taken literally, is a simple "um, no, we don't" - because this is an official problem, and that's the correct answer. DO NOT QUESTION THE CORRECT ANSWER TO AN OFFICIAL PROBLEM; instead of questioning it, just learn from it.

--

in any case, when there are two or more actions connected by a conjunction, you don't need to repeat the subject (unless, of course, the two actions have different subjects).

this should be clear in shorter sentences. for instance,
james took his bag and went home
the ball bounced off the wall and fell into the field
these are OK sentences; there's no need to add "he" before went home, or "it" before fell into the field. those additions would be redundant and would also obfuscate the meaning a bit. (notice the pattern in that last sentence, too.)

if you understand why those shorter sentences are ok, then you also understand why the longer sentence (the one you quoted) is ok - it's the same principle. however, this is the way it goes - things that are obvious in shorter sentences suddenly become non-obvious in longer sentences. crazy.