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.
- not caused by stress, alcohol, or rich foods, but
- not caused by stress, alcohol, or rich foods, but are by
- caused not by stress, alcohol, or rich foods, but by
- caused not by stress, alcohol, and rich foods, but
- caused not by stress, alcohol, and rich foods, but are by
这题对答案C没有异议,就是想请教下,A 的结构中not否定了实意动词cause 后面的连词用or ,C中的not 否定了状语,后面连词也用or,是否一个句子中只要出现否定词not 和no, 后面的连词都用or 呢? 希望我说清楚了 |