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Q81. Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich foods, but a bacterium that dwells in the mucous lining of the stomach.
(A) not caused by stress, alcohol, or rich foods, but (B) not caused by stress, alcohol, or rich foods, but are by (C) caused not by stress, alcohol, or rich foods, but by (D) caused not by stress, alcohol, and rich foods, but (E) caused not by stress, alcohol, and rich foods, but are by
Can someone please explain why you are not allowed to insert an 'are' in this idiom? (answer choice (B))
Why 'are' is not allowed here? I think that this structure maintains parallelism:
Re: Idiom NOT x BUT y ... don't fully understand parallelism [#permalink]
15 Nov 2011, 04:35
Answer C is correct.
According to option C the sentence structure is that Recent physicians have .... are caused NOT X BUT Y. Here " are caused " is parallel to both X and Y. Hence we need not repeat it at Y. This structure can also be rephrased as: Recent physicians have... are NOT X BUT Y. But in this case "cause" has to be included in both the parts X and Y.
Hope it clarifies. _________________
D- Day December 30 2011. Hoping for the happiest new year celebrations !