Before we jump in, let’s talk about “not/but” constructions on the GMAT. It seems like a lot of people view that construction as an idiom that needs to be memorized: “not only… but also…” But I don’t really think that’s the best way to think about it (and
I’m opposed to memorizing idioms in general, unless you have TONS of spare time on your hands).
A better way to think about “not… but…” constructions is that they indicate parallelism. In general, whatever follows “not” (or “not only” or “not just”) needs to be parallel to whatever follows “but” (or “but also”). That’s the most important thing: think of “not/but” as a parallelism trigger, not an idiom.
But then what about the “only” and the “also”? Honestly, I don’t pay much attention to them. There is absolutely no rule indicating that “not only” must be followed by “but also.” In theory, “only” and “also” might tweak the meaning of the sentence – but absolutely ANY word can tweak the meaning of the sentence. There’s nothing special about these particular words.
So just because you have the phrase “but also” doesn’t mean that you need a “not only.” And just because you have a “not only” doesn’t mean that you need a “but also.” Either can exist in isolation, as long as the sentence makes sense.
Don’t get me wrong: “not/but” constructions are pretty common on the GMAT, and you should definitely pay attention to them. But you’ll want to focus on them as parallelism triggers, and not as some sort of standard phrase that MUST appear in the same form every time.
With that in mind, this question gets a whole lot easier...
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A. they can also pilfer valuable information such as business development strategies, new product specifications, and contract bidding plans, and sell
The first things I notice are the two uses of “and”, both of which indicate some sort of parallelism. (And again: “not only” is just hanging out by itself. We do NOT have a “not/but” construction here, since there’s no “but.” That’s complete fine, and not worth worrying about, as long as it makes sense meaning-wise.)
So let’s figure out what’s actually parallel here. We actually have two different “lists”, since we have two different “and’s”:
- ”they can also pilfer valuable information such as business development strategies, new product specifications, and contract bidding plans, and sell…” → Totally fine! The thieves do two things: “pilfer (a bunch of data)” and “sell the data to competitors.” Makes sense.
- ”they can also pilfer valuable information such as business development strategies, new product specifications, and contract bidding plans, and sell…” → Also fine! The thieves pilfer three examples of valuable information: business development strategies, new product specifications, and contract bidding plans.
I don’t see any issues at all here, so let’s keep (A).
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B. they can also pilfer valuable information that includes business development strategies, new product specifications, and contract bidding plans, and selling
There are only two things that change from (A) to (B). First, “valuable information such as” has been changed to “valuable information that includes”, and I don’t think that’s a huge problem, but I think it’s a little bit clearer to just say “such as.” After all, these are just examples of “valuable information.”
The bigger problem: “and sell” has been changed to “and selling.” “Selling” follows the parallelism trigger “and”, and that’s a problem: nothing is parallel with “selling” (a participle, if you like jargon).
And that’s a perfectly good reason to eliminate (B).
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C. also pilfering valuable information including business development strategies, new product specifications, and contract bidding plans, selling
And now we have an epic mess of unnecessary “-ing” modifiers!
For starters, I don’t understand why we would say “…not only are thieves able to divert cash from company bank accounts, also pilfering valuable information…” There’s no reason for “pilfering” to be a modifier here. It needs to be a verb, as it is in answer choice (A).
I’d make a similar argument for the word “selling”, which seems to modify the preceding phrase (“…also pilfering valuable information including (three things)…”). That doesn’t really make sense, though: “selling” is a separate action from “pilfering”, and there’s no good reason for one of them to modify the other.
So we can eliminate (C), too.
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D. but also pilfer valuable information such as business development strategies, new product specifications, and contract bidding plans to sell
Now we finally have that “not/but” construction that everybody loves so much. Again: you want to think of it as a parallelism trigger, not as an idiom.
And there’s a problem with the parallelism! We have “not only
are thieves able to divert cash… but also
pilfer valuable information such as….” The “not only” is followed by a clause, with a subject and a verb; “but also” is followed by just a verb and an object – so NOT a clause. Structurally, this isn’t parallel at all.
The phrase “to sell” isn’t ideal, either. Even if we rearrange a little bit to fix the parallelism, we have “(thieves) pilfer valuable information… to sell the data to competitors.” That’s not necessarily WRONG, exactly, but it seems like a lousy way to say “(thieves) pilfer valuable information… AND sell the data to competitors.” It’s much clearer if “pilfer” and “sell” are structurally parallel, since we have two parallel actions completed by the thieves.
So (D) is gone.
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E. but also pilfering valuable information such as business development strategies, new product specifications, and contract bidding plans and selling
(E) is a funky mashup of some of the mistakes in the other answer choices. The parallelism doesn’t work, for starters: just like (D), (E) gives us “not only (clause)… but also (verb)…” See the explanation for (D) for more on that issue. There’s also no good reason to structure “pilfering” and “selling” as modifiers, when they could be nice, clear verbs.
So (E) is out, and we’re left with (A).