新东方网GMAT频道在此和大家分享GMAT语法练习题GWD-TN-1-Q19,希望对大家掌握GMAT语法有所帮助。
(GWD-TN-1-Q19) 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
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