Since conscious patients often died of shock on the operating table, the invention of anesthesia was essential to the development of surgery as the invention of the propeller was to powered flight.
(A) the invention of anesthesia was essential to the development of surgery as the invention of the propeller was to powered flight
(B) inventing anesthesia was as essential for the development of surgery as the invention of the propeller was for powered flight
(C) the invention of anesthesia was as essential in the development of surgery much as the invention of the propeller had been for powered flight
(D) the invention of anesthesia was as essential to the development of surgery as the invention of the propeller was to powered flight
(E) the invention of anesthesia was essential to the development of surgery, so was the invention of the propeller essential to powered flight
OA: D
I know the OA has as...as. But A does a clear clause comparison using 'as' for noun clauses.
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invention of anesthesia
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crossingfingers
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crossingfingers
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