So I've seen a lot of test-takers make mistakes on this question, usually because of overreliance on an idiom “rule” that doesn’t really exist. If you see the phrase “not only”, that does NOT automatically mean that you need to have a “but also” somewhere else in the sentence! There’s no reason why you couldn’t use the phrase “not only” by itself, as long as it makes logical sense with the context of the sentence.
Don’t get me wrong: “not… but” phrases are pretty important on the GMAT, but only because they require parallelism. Basically, whatever follows the word “not” (or “not only”) must be structurally parallel to whatever follows the word “but” (or “but also”). (Similar parallelism rules apply to both/and and either/or constructions – more on these in an upcoming
Topic of the Week.)
But again, there’s nothing wrong with having “not only” without the “but also.”
Quote:
A. they can also pilfer valuable information such as business development strategies, new product specifications, and contract bidding plans, and sell
“They” jumps out at me right away, but I think it’s fine, since it refers to “thieves.” I suppose “they” could also refer to “bank accounts,” but I don’t think the pronoun is automatically wrong. Ambiguity isn’t an absolute rule (see our
YouTube webinar on this pronouns for more), and “they” isn’t particularly confusing here.
The parallelism also seems OK, even if it doesn’t sound great. We have two different lists going on in (A). First, we have a pair of parallel verbs: “…they can also
pilfer information… and
sell data…” That seems fine. We also have a list of the types of information that thieves pilfer: “…such as business development strategies, new product specifications, and contract bidding plans…” That’s just three parallel nouns – no problem. Keep (A).
Quote:
B. they can also pilfer valuable information that includes business development strategies, new product specifications, and contract bidding plans, and selling
(B) is very similar to (A), except that the final “and” is followed by “selling.” And that’s a problem, because I don’t know what “selling” is parallel to: nothing in the sentence is in the same format. Logically, “selling” should be parallel to “pilfer”, but in that case, it should be “…they pilfer… and sell…”, as in answer choice (A). (B) can be eliminated.
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C. also pilfering valuable information including business development strategies, new product specifications, and contract bidding plans, selling
The big change here is that “pilfering” and “selling” are now “-ing” words – modifiers, in this case. (Feel free to check out our
guide to “-ing” words for more on this topic.)
But that doesn’t really make any sense. “As criminal activity on the Internet becomes more and more sophisticated, not only are thieves able to divert cash from company bank accounts,
pilfering valuable information…” For this to be correct, “pilfering valuable information” would have to modify “not only are thieves able to divert cash…” – and it simply doesn’t. These are completely different types of criminal activity, and the “pilfering valuable information” does not modify “diverting cash.”
Similarly, “selling” is basically hanging out on its own. I guess it’s trying to modify the previous phrase beginning with “pilfering”, but I can’t make much sense of that, either. (C) is out.
Quote:
D. but also pilfer valuable information such as business development strategies, new product specifications, and contract bidding plans to sell
OK, now we really do have a “not only… but also” structure, which means that we need to think about parallelism again. There’s not much wiggle-room here: whatever follows “not only” needs to be parallel to whatever follows “but also.”
So we have: “not only
are thieves able to divert cash… but also
pilfer valuable information…” This isn’t awful, but it doesn’t quite seem parallel to me: “not only are thieves” gives us a subject and a verb, but the “but also” is followed only by a verb.
Plus, “to sell” seems to only modify “contract bidding plans”, and that’s not quite right: the thieves are selling the strategies and specifications, too. (A) makes much more sense than (D).
Quote:
E. but also pilfering valuable information such as business development strategies, new product specifications, and contract bidding plans and selling
The parallelism is much more thoroughly flawed in (E). We have: “not only
are thieves able to divert cash… but also
pilfering valuable information…” Definitely not parallel. (E) is out, and (A) is the correct answer.