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GMATNinja could you help explain why A is incorrect.
Thanks in advance!
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Diesel engines burn as much as 30 percent less fuel than that burned by gasoline engines of comparable size while emitting far less carbon dioxide gas and far fewer of the other greenhouse gases that have been implicated in global warming.


A) burn as much as 30 percent less fuel than that burned by gasoline engines

B) burn as much as 30 percent less fuel than that for gasoline engines that are

C) burn as much as 30 percent less fuel than do gasoline engines

D) burning as much as 30 percent less fuel than do gasoline engines that are

E) that burn as much as 30 percent less fuel than that burned by gasoline engines

A is wrong because the elements are not parallel. What does that refers to after than?
It refers to fuel.
So, lets see the sentence: -
Diesel engines burn as much as 30 percent less fuel than that(fuel) burned by gasoline engines
Is this making sense now? No, right?
We need to have Diesel engines burn as much as 30 percent less fuel than burned by gasoline engines - this choice is presented in C.
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Let's read choice A together with the non-underlined phrase 'diesel engines' and one can understand why A is wrong. It is nothing but an illegal comparison of the diesel engines with 'that', i.e. fuel, (as also in B). Only C correctly compares how much diesel engines burn to how much gasoline engines burn.
D and E are outright fragments.
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Diesel engines burn as much as 30 percent less fuel than that burned by gasoline engines of comparable size while emitting far less carbon dioxide gas and far fewer of the other greenhouse gases that have been implicated in global warming.


A) burn as much as 30 percent less fuel than that burned by gasoline engines
- " Diesel engines burn as much as 30 percent less fuel than fuel burned by gasoline engines"-- clearly incorrect
comparison between" diesel engines" and "fuel"

B) burn as much as 30 percent less fuel than that for gasoline engines that are
- Same comparison issue as in choice A
- "that are"- unnecessarily wordy
gasoline engines that are of comparable size is wordy ..gasoline engines of comparable size is more concise.


C) burn as much as 30 percent less fuel than do gasoline engines
- Correct

D) burning as much as 30 percent less fuel than do gasoline engines that are
- Verb "burn" is required to complete sentence. "burning"- is not verb so choice D is fragment.

E) that burn as much as 30 percent less fuel than that burned by gasoline engines
- Verb is missing for subject " Diesel engines" so choice E is fragment.

Ans choice C is Correct
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Diesel engines burn as much as 30 percent less fuel than that burned by gasoline engines of comparable size while emitting far less carbon dioxide gas and far fewer of the other greenhouse gases that have been implicated in global warming.


A) burn as much as 30 percent less fuel than that burned by gasoline engines
- " Diesel engines burn as much as 30 percent less fuel than fuel burned by gasoline engines"-- clearly incorrect
comparison between" diesel engines" and "fuel"

B) burn as much as 30 percent less fuel than that for gasoline engines that are
- Same comparison issue as in choice A
- "that are"- unnecessarily wordy
gasoline engines that are of comparable size is wordy ..gasoline engines of comparable size is more concise.


C) burn as much as 30 percent less fuel than do gasoline engines
- Correct

D) burning as much as 30 percent less fuel than do gasoline engines that are
- Verb "burn" is required to complete sentence. "burning"- is not verb so choice D is fragment.

E) that burn as much as 30 percent less fuel than that burned by gasoline engines
- Verb is missing for subject " Diesel engines" so choice E is fragment.

Ans choice C is Correct


Could you please explain why "burning" is not a verb in this case? Thanks!
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Diesel engines burn as much as 30 percent
less fuel
than
that burned by gasoline engines of comparable size while emitting far less carbon dioxide gas and far fewer of the other greenhouse gases
that have been implicated in global warming.

A. burn as much as 30 percent less fuel than that burned by gasoline engines.
Active not parallel to Passive comparison. [comparison between" diesel engines" and "fuel"]
B. burn as much as 30 percent less fuel than that for gasoline engines that are
Unnecessary Wordy.
C. Action {X burn as much as 30 percent } || Action { do[burn] gasoline engines}
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Hello,
I am having trouble understanding how "do" is correct in option C. Is it correct to say "Diesel engines burn as much as 30 percent less fuel than do [burn] gasoline engines"?

That seems off to me? Could you please explain the logic
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