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.
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Anot caused by stress, alcohol, or rich foods, but
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Bnot caused by stress, alcohol, or rich foods, but are by
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Ccaused not by stress, alcohol, or rich foods, but by
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Dcaused not by stress, alcohol, and rich foods, but
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Ecaused not by stress, alcohol, and rich foods, but are by
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正确答案: C