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GWD1-Q19: Recently physicianshave determined that stomach ulcers are not caused by stress, alcohol, orrich foods, but a bacterium that dwells in the mucous lining of thestomach. A. notcaused by stress, alcohol, or rich foods, but B. notcaused by stress, alcohol, or rich foods, but are by C. causednot by stress, alcohol, or rich foods, but by D. causednot by stress, alcohol, and rich foods, but E. causednot by stress, alcohol, and rich foods, but are by
I choose B, it's weird that "caused not".... I think it should be " are not caused".
at the same time "are by" is good to compare to " are caused"... The answer is C...
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