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Quote:
Hand ale pumps may slightly improve the flavor of ale over gas-powered kegs, but modern pub managers contend that hand ale pumps cost twice as much as maintaining gas-powered kegs.

A) hand ale pumps cost twice as much as maintaining gas-powered kegs

B) hand ale pumps cost twice as much to maintain as gas-powered kegs do

C) maintaining hand ale pumps costs twice as much as gas-powered kegs do

D) maintaining hand ale pumps costs twice as much as it does for gas-powered kegs

E) to maintain hand ale pumps costs twice as much as for gas-powered kegs

A - hand ale pumps cost - maintaining gas powered. wrong comparison

B - even though idiom as much as gotten broken, it can not be the only elimination - keep

C - maintaining hand pumps - as gas powered pumps do - reverse comparison as it is in A - out

d - maintaining hand pumps - it does for gas - wrong comparison

E - to maintain - for gas - parallel structure required.

B is the best.
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My answer is (B). It took me 1'24''.

For comparison, we have to ensure parallelism.

(A) A costs twice as much as B - Needs to ensure A and B are parallel. Here, "hand ale pumps" (a phrasal noun in plural form) cannot be compared with "maintaining gas-powered kegs" (A gerund - treated as a singular)
(C) "maintaining hand ale pumps" (A gerund - treated as a singular) cannot be matched with "gas-powered kegs"(a phrasal noun in plural form)
(D) "maintaining hand ale pumps" (A gerund - treated as a singular) cannot be matched with "is". There might be other issues.
(E) “to maintain hand ale pumps” (A infinitive - treated as a singular) cannot be matched with "for gas-powered kegs" (a preposition phrase).

Take a final look at B, and confirm that its parallelism is flawless.
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Hand ale pumps may slightly improve the flavor of ale over gas-powered kegs, but modern pub managers contend that hand ale pumps cost twice as much as maintaining gas-powered kegs.


X as much as Y - X,Y needs to be parallel & comparison should be btw identical things (i.e; we can't compare legs with hands :P)

A) hand ale pumps cost twice as much as maintaining gas-powered kegs - Cost twice is not parallel to maintaining ; costs of(HP) is compared to maintenance of (GP) - INCORRECT

B) hand ale pumps cost twice as much to maintain as gas-powered kegs do - Costs to maintain (HP) is compared to Costs to maintain of (GP) & it is grammatically correct

C) maintaining hand ale pumps costs twice as much as gas-powered kegs do - replace do with costs & understand the meaning - Awkward right - Eliminate it

D) maintaining hand ale pumps costs twice as much as it does for gas-powered kegs - as it does isn't parallel with costs twice - INCORRECT

E) to maintain hand ale pumps costs twice as much as for gas-powered kegs - costs twice isn't parallel with (for gp keys) - INCORRECT
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IMO-B

Comparison between cost of maintaining hand ale pump and cost of maintaining gas powered kegs
X As much as y is correct idiom in which x and Y require parallelism

A) hand ale pumps cost twice as much as maintaining gas-powered kegs -incorrect -wrong placement of maintaining

B) hand ale pumps cost twice as much to maintain as gas-powered kegs do - correct

C) maintaining hand ale pumps costs twice as much as gas-powered kegs do -incorrect use of maintaining is wrong

D) maintaining hand ale pumps costs twice as much as it does for gas-powered kegs -incorrect-pronoun ambiguity and incorrect use of maintaining

E) to maintain hand ale pumps costs twice as much as for gas-powered kegs- placement of to maintain is wrong

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I am making these repeated errors. For this question I chose C, but after checking realized that answer should be B, because -

A - Hand ale pumps are compared to maintenance of gas-powered kegs
B - Correct comparison
C - Maintenance of Hand ale pumps is compared to gas-powered kegs



Hand ale pumps may slightly improve the flavor of ale over gas-powered kegs, but modern pub managers contend that hand ale pumps cost twice as much as maintaining gas-powered kegs.

A) hand ale pumps cost twice as much as maintaining gas-powered kegs

B) hand ale pumps cost twice as much to maintain as gas-powered kegs do

C) maintaining hand ale pumps costs twice as much as gas-powered kegs do

D) maintaining hand ale pumps costs twice as much as it does for gas-powered kegs

E) to maintain hand ale pumps costs twice as much as for gas-powered kegs[/quote]
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The official explanation is here.
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