Mo2men wrote:Dear GMATGuruNY,
Is the OA: E clear? or does it need verb 'do'? is understood from the context.
My proposed choice:
(E) less of certain pollutants than do those burning gasoline or diesel fuel
Thanks in advance for your help
Both of the following are viable:
Vehicles powered by natural gas emit less of certain pollutants than those burning gasoline or diesel fuel.
Vehicles powered by ndatural gas emit less of certain pollutants than do those burning gasoline or diesel fuel.
The inclusion of
do is optional.
With or without
do, the intended comparison is clear:
Vehicles powered by natural gas emit less of certain pollutants than those burning gasoline or diesel fuel [emit certain pollutants].
No verb is required in the second clause as long as the intended comparison is crystal clear.
Correct:
John ate more pizza than Mary.
Here, only interpretation is possible:
John ate more pizza than Mary ate.
Since the intended comparison is crystal clear, a verb is not required in the second clause.
Not viable:
Russia exports more oil to Europe than the United States.
Here, the intended comparison is NOT crystal clear.
Two possible meanings:
Case 1:
Russia exports more oil to Europe than IT EXPORTS OIL TO THE UNITED STATES.
Case 2:
Russia exports more oil to Europe than THE UNITED STATES EXPORTS OIL TO EUROPE.
If Case 2 is intended, a verb is required in the second clause to make the intended comparison crystal clear.
Correct:
China exports more oil to Europe than DOES the United States.
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