by Sage Pearce-Higgins Mon Apr 30, 2018 7:32 am
For this problem, an easier way to eliminate answer A is to ask 'what is the pronoun 'it' referring to?'. We can find pretty substantial problems with all the answers except C, and that is enough to solve the problem. However, it's useful to analyze correct answer choices to see the kind of constructions that GMAT considers acceptable.
Please try to avoid making the threads really messy by quoting unnecessary material.
The word 'as', when used alone, is a marker for a comparison of clauses. We have to make sure that that comparisons are parallel, although what that means isn't always clear. A simple example is 'Stacey is studying for GMAT, as Noah is.' You can see a nice balance between the two clauses here.
With this difficult problem, GMAT pushes the boundaries of parallelism to confuse the test-taker. Let's consider what the sentence is trying to say:
Prescriptions are the cornerstone of a successful on-line drugstore, [just] as prescriptions are the cornerstone of traditional pharmacies.
Already the singular / plural difference might confuse some people, but that's okay for parallelism.
It's clunky to repeat 'prescriptions are the cornerstone of' so let's say something like 'this is the case for' instead.
Prescriptions are the cornerstone of a successful on-line drugstore, [just] as this is the case for traditional pharmacies.
We don't need the 'this' in the sentence (and GMAT tends to avoid using 'this' to refer to a previous clause).
Prescriptions are the cornerstone of a successful on-line drugstore, as is the case for traditional pharmacies.
Then, to really mess with people's expectations, let's reverse the order of the clauses.
As is the case with traditional pharmacies, prescriptions are the cornerstone of a successful on-line drugstore
In conclusion, I would say that there is parallelism here, but it's pushed to the boundaries of what GMAT considers acceptable, and is hidden away.
As for your example, I'd say it's incorrect (but not massively so). I would omit 'in the case of':
As in Australia, migration activities take place among lizards once they turn 2 years old in New Zealand.
You can see that there is a parallel structure here.