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Answer choice E, as it maintains the parallelism of "that are ... were".

The "were" cannot be omitted because the planets were visited in the past, hence, A-D are incorrect.
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The presence of superionic ice likely explains the lopsided, off-center magnetic fields of Uranus and Neptune; the solar system’s seventh and eighth planets that are known as ice giants and visited briefly by NASA’s Voyager 2 spacecraft in the 1980s.


A. Neptune; the solar system’s seventh and eighth planets that are known as ice giants and visited - not parallel and after ; a independent clause must follow

B. Neptune: the solar system’s seventh and eighth planets that are known as ice giants and - same as A

C. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and - parallelism error as A

D. Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and - modifier error

E. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and were visited - A noun (planets) + noun modifer (that clause)
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The presence of superionic ice likely explains the lopsided, off-center magnetic fields of Uranus and Neptune; the solar system’s seventh and eighth planets that are known as ice giants and visited briefly by NASA’s Voyager 2 spacecraft in the 1980s.

A. Neptune; the solar system’s seventh and eighth planets that are known as ice giants and - We have a modifier phrase after the ';'

B. Neptune: the solar system’s seventh and eighth planets that are known as ice giants and - We need the verb in past tense after 'and'

C. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and - Same as B

D. Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and - Same as B. 'which' incorrectly refers to just 'Neptune'.

E. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and were - Correct.

Answer: E
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option E is correct where "were" is being used correctly. Rest all do have verb-ed modifier followed by parallelism error.
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E is best among others. However, I feel that we should repeat THAT after and to make it more proper and easy.

still E is Right because there is no verb to whom we can associate "were" to.

E is the Answer.
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Bunuel
The presence of superionic ice likely explains the lopsided, off-center magnetic fields of Uranus and Neptune; the solar system’s seventh and eighth planets that are known as ice giants and visited briefly by NASA’s Voyager 2 spacecraft in the 1980s.


A. Neptune; the solar system’s seventh and eighth planets that are known as ice giants and

B. Neptune: the solar system’s seventh and eighth planets that are known as ice giants and

C. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and

D. Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and

E. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and were

VeritasKarishma :

Why in option E we don,t have another "that" before were.

Isn't it required to make parallel relative clauses?
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Bunuel
The presence of superionic ice likely explains the lopsided, off-center magnetic fields of Uranus and Neptune; the solar system’s seventh and eighth planets that are known as ice giants and visited briefly by NASA’s Voyager 2 spacecraft in the 1980s.


A. Neptune; the solar system’s seventh and eighth planets that are known as ice giants and

B. Neptune: the solar system’s seventh and eighth planets that are known as ice giants and

C. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and

D. Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and

E. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and were

VeritasKarishma :

Why in option E we don,t have another "that" before were.

Isn't it required to make parallel relative clauses?

The first "that" is common to both.
... that are known as ... and (that) were visited ...

You don't need to repeat it.
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D) Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and

In option D, i was a bit confused regarding the usage of which.

Is which referring to Uranus and Neptune(or) only Neptune?
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While I would agree with E being the best answer choice, I am not 100% happy with it.

In my opinion, the statement makes it sound like there are at least 8 ice giants in our solar system. :(
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D) Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and

In option D, i was a bit confused regarding the usage of which.

Is which referring to Uranus and Neptune(or) only Neptune?
Option D is:

... Uranus and Neptune, which are the solar system’s seventh and eighth planets...

Given that there is an are there, and that the which includes information about both planets, I think we can safely say that the which is meant to refer to Uranus and Neptune.
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The rest of the choices are so tempting except for the last word, "were" If something happened in the 80s, it should be past tense, right? the planets "were" briefly visited in the 80s.

E.
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Bunuel
The presence of superionic ice likely explains the lopsided, off-center magnetic fields of Uranus and Neptune; the solar system’s seventh and eighth planets that are known as ice giants and visited briefly by NASA’s Voyager 2 spacecraft in the 1980s.


A. Neptune; the solar system’s seventh and eighth planets that are known as ice giants and

B. Neptune: the solar system’s seventh and eighth planets that are known as ice giants and

C. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and

D. Neptune, which are the solar system’s seventh and eighth planets, known as ice giants, and

E. Neptune, the solar system’s seventh and eighth planets that are known as ice giants and were

All the options except E say that the ice giants visited briefly, however, ice giants cannot by themselves visit but they can only be visited by someone and thus, option E which clears this is the right option.
Answer: E
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Can the modifier for both the planets "the solar system's seventh.....that are....were" act as a descriptive phrases since they are clauses with auxiliary verbs? AndrewN ?
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Can the modifier for both the planets "the solar system's seventh.....that are....were" act as a descriptive phrases since they are clauses with auxiliary verbs? AndrewN ?
Sure, lakshya14, that presents no problem at all. The two-pronged embedded clause in (E) is not independent, since you could not write a standalone sentence that featured either continuation from the auxiliary verb on:

1) The solar system’s seventh and eighth planets that are known as ice giants. (Fragment—no verb in the main clause.)

2) The solar system’s seventh and eighth planets that were visited briefly by NASA’s Voyager 2 spacecraft in the 1980s. (Same issue as before.)

We would need a verb to follow the subordinate clause in either sentence to create an overarching independent clause. Thus, what we see in (E) is a modifying phrase for the objects of the preposition in the main clause, Uranus and Neptune. It just happens to follow an X and Y form within an embedded clause.

I hope that helps. I know the phrase at the end is longer than we may be used to seeing, and that it builds from a complex element, but if you follow the grammar, you will see that it is still nothing more than a modifier.

Thank you for thinking to ask me.

- Andrew
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