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Sentences starting with "Since" are a standard question type of Present-Perfect Tense problems in GMAT. Only options D and E use present tense with the use of "has". In D, "rigorously" is wrongly used as a noun. Hence, E is the correct answer.
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Correct Option E

Original sentence: Since the beginning of the year,
the community medical clinic
verified rigorously the potency of each flu vaccine sample,
lest any of its patients are
vulnerable to the flu.

A. verified rigorously the potency of each flu vaccine sample, lest any of its patients are
Wrong:
1. SVA Error {subject: The community medical clinic - Singular, are - plural}
2. Verb modifiing adverb.
verified - verb, rigorously - adverb: this must be rigorously verfied - to be grammeratically correct.
3. "are" is wrong verb, makes intended meaning error flaw

B. rigorously verified the potency of each flu vaccine sample, lest any of its patients would be
D. rigorously has verified the potency of each flu vaccine sample, lest any of its patients are
Wrong:
1. Rigorously - adverb, acting as Noun
2. SVA Error {subject: The community medical clinic - Singular, are - plural}
3. "are" is wrong verb, makes intended meaning error flaw - option D

C. is rigorously verifying the potency of each flu vaccine sample, lest any of its patients not be
Wrong:
1. Tense Error - Present tense "is"
2. Intended meaning error - "patients not be"

E. has verified rigorously the potency of each flu vaccine sample, lest any of its patients be - Correct
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Bunuel could you please provide the explanation for the below question?

Shouldnt the correct answer choice start with 'rigorously verified' and not 'verified rigorously'?
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Divsri
Bunuel could you please provide the explanation for the below question?

Shouldnt the correct answer choice start with 'rigorously verified' and not 'verified rigorously'?
Hello, Divsri. I am not Bunuel, and I do not have the Magoosh OE. However, I can say that while rigorously verified might be more common and natural sounding than verified rigorously, there are similar constructs with words that are pretty close to these two in meaning in which the adverb follows the verb: worked tirelessly comes to mind. (I would bet that most native speakers would have the same unpleasant reaction to tirelessly worked that many people here seem to have with verified rigorously.)

The bigger issue here lies in the verb tense or form that is used with the shell of the sentence at the bookends of the underlined portion. First, a since time marker creates an expectation that a perfect tense will follow, as in, Since the dawn of time, humans have... Only answer choices (D) and (E) deliver to this end. Then, although I doubt that the conjunction lest would appear on the exam, since it is antiquated and rarely encountered in conversation outside of quotations of historical or legal documents, its appearance does trigger the use of the subjunctive tense in American English. See, for instance, the sample sentences provided for the entry at Dictionary.com:

1) He kept his notes by his side lest faulty memory lead him astray.

2) There was danger lest the plan become known.

Only answer choices (C) and (E) follow through to this end, and (C) creates a problem—lest is used as a sort of negation to mean so that X does not happen. Choice (C), by pairing lest + not, creates a double negative that would not be encountered with the correct usage of the conjunction—so that any of its patients [would] not NOT be?

When you put the two considerations together, only (E) makes sense. The placement of the adverb is up for debate, perhaps, but the verb tense at the beginning and the end of the underlined portion is not.

One final piece of advice: Have fun with these questions by third parties, but stick to official Verbal questions for GMAT™ preparation. Nothing I have seen (or even created) has come close to matching the integrity of official questions.

Good luck with your studies.

- Andrew
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